Fix incorrect relative pathing assumption in msvs generator.
Fix incorrect relative pathing assumption in msvs generator.

BUG=None
TEST=None

Review URL: http://codereview.chromium.org/1819003

git-svn-id: e7e1075985beda50ea81ac4472467b4f6e91fc78@820 78cadc50-ecff-11dd-a971-7dbc132099af

android-ia/platform_external_chromium_org_tools_gyp,azunite/gyp,MIPS/external-chromium_org-tools-gyp,xin3liang/platform_external_chromium_org_tools_gyp,Omegaphora/external_chromium_org_tools_gyp,bnoordhuis/gyp,ryfx/gyp,springmeyer/gyp,MIPS/external-chromium_org-tools-gyp,Jack-Q/GYP-copy,bnq4ever/gypgoogle,trafi/gyp,carlTLR/gyp,pyokagan/gyp,lukeweber/gyp-override,Jack-Q/GYP-copy,azunite/gyp_20150930,svn2github/kgyp,mumble-voip/libmumble-gyp,LazyCodingCat/gyp,sdklite/gyp,tarc/gyp,duanhjlt/gyp,duanhjlt/gyp,enkripsi/gyp,bpsinc-native/src_tools_gyp,sport-monkey/GYP,trafi/gyp,IllusionRom-deprecated/android_platform_external_chromium_org_tools_gyp,mumble-voip/libmumble-gyp,AOSPU/external_chromium_org_tools_gyp,alexcrichton/gyp,yinquan529/platform-external-chromium_org-tools-gyp,pandaxcl/gyp,channing/gyp,okwasi/gyp,mistydemeo/gyp,bulldy80/gyp_unofficial,ryfx/gyp,omasanori/gyp,azunite/gyp,sport-monkey/GYP,bulldy80/gyp_unofficial,pyokagan/gyp,okumura/gyp,mgamer/gyp,bnq4ever/gypgoogle,bdarnell/gyp,cysp/gyp,azunite/gyp_20150930,chromium/gyp,sanyaade-teachings/gyp,brson/gyp,mapbox/gyp,mgamer/gyp,dougbeal/gyp,yjhjstz/gyp,saghul/gyn,mgamer/gyp,carlTLR/gyp,kevinchen3315/gyp-git,geekboxzone/lollipop_external_chromium_org_tools_gyp,azunite/gyp,ttyangf/pdfium_gyp,Danath/gyp,IllusionRom-deprecated/android_platform_external_chromium_org_tools_gyp,bnoordhuis/gyp,yinquan529/platform-external-chromium_org-tools-gyp,mumble-voip/libmumble-gyp,tarc/gyp,msc-/gyp,turbulenz/gyp,turbulenz/gyp,svn2github/gyp,brson/gyp,adblockplus/gyp,carlTLR/gyp,lianliuwei/gyp,yangrongwei/gyp,openpeer/webrtc-gyp,bpsinc-native/src_tools_gyp,Omegaphora/external_chromium_org_tools_gyp,sdklite/gyp,Danath/gyp,carlTLR/gyp,omasanori/gyp,svn2github/kgyp,azunite/gyp_20150930,ttyangf/pdfium_gyp,sloanyang/gyp,openpeer/webrtc-gyp,saghul/gyn,Phuehvk/gyp,okumura/gyp,mistydemeo/gyp,luvit/gyp,pyokagan/gyp,bnoordhuis/gyp,Danath/gyp,mkrautz/gyp-libmumble,bulldy80/gyp_unofficial,springmeyer/gyp,enkripsi/gyp,lukeweber/gyp-override,springmeyer/gyp,xin3liang/platform_external_chromium_org_tools_gyp,ttyangf/pdfium_gyp,omasanori/gyp,mapbox/gyp,Phuehvk/gyp,ttyangf/gyp,luvit/gyp,adblockplus/gyp,erikge/watch_gyp,AWhetter/gyp,luvit/gyp,sanyaade-teachings/gyp,AOSPU/external_chromium_org_tools_gyp,yjhjstz/gyp,LazyCodingCat/gyp,saghul/gyn,LazyCodingCat/gyp,bnq4ever/gypgoogle,clar/gyp,chromium/gyp,yangrongwei/gyp,Chilledheart/gyp,clar/gyp,sfiera/gyp,pyokagan/gyp,IllusionRom-deprecated/android_platform_external_chromium_org_tools_gyp,android-ia/platform_external_chromium_org_tools_gyp,openpeer/webrtc-gyp,chromium/gyp,pandaxcl/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,sanyaade-teachings/gyp,bnq4ever/gypgoogle,svn2github/kgyp,tarc/gyp,yangrongwei/gyp,channing/gyp,svn2github/kgyp,lianliuwei/gyp,Chilledheart/gyp,bpsinc-native/src_tools_gyp,saghul/gyn,okumura/gyp,yinquan529/platform-external-chromium_org-tools-gyp,azunite/gyp_20150930,brson/gyp,azunite/gyp_20150930,kevinchen3315/gyp-git,Phuehvk/gyp,AWhetter/gyp,cchamberlain/gyp,ttyangf/pdfium_gyp,openpeer/webrtc-gyp,duanhjlt/gyp,erikge/watch_gyp,alexcrichton/gyp,bpsinc-native/src_tools_gyp,chromium/gyp,okwasi/gyp,sdklite/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,sfiera/gyp,amoikevin/gyp,yjhjstz/gyp,bdarnell/gyp,android-ia/platform_external_chromium_org_tools_gyp,clar/gyp,Chilledheart/gyp,android-ia/platform_external_chromium_org_tools_gyp,bulldy80/gyp_unofficial,adblockplus/gyp,Omegaphora/external_chromium_org_tools_gyp,yinquan529/platform-external-chromium_org-tools-gyp,Chilledheart/gyp,svn2github/gyp,Phuehvk/gyp,AWhetter/gyp,azunite/gyp,amoikevin/gyp,ryfx/gyp,openpeer/webrtc-gyp,mistydemeo/gyp,okumura/gyp,azunite/gyp,Jack-Q/GYP-copy,mgamer/gyp,sdklite/gyp,omasanori/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,adblockplus/gyp,erikge/watch_gyp,mistydemeo/gyp,Chilledheart/gyp,trafi/gyp,chromium/gyp,amoikevin/gyp,sloanyang/gyp,LazyCodingCat/gyp,dougbeal/gyp,ryfx/gyp,mumble-voip/libmumble-gyp,amoikevin/gyp,svn2github/kgyp,ttyangf/pdfium_gyp,springmeyer/gyp,mkrautz/gyp-libmumble,yangrongwei/gyp,pandaxcl/gyp,pandaxcl/gyp,lukeweber/gyp-override,svn2github/gyp,MIPS/external-chromium_org-tools-gyp,trafi/gyp,kevinchen3315/gyp-git,Phuehvk/gyp,sanyaade-teachings/gyp,sanyaade-teachings/gyp,mapbox/gyp,ryfx/gyp,tarc/gyp,turbulenz/gyp,dougbeal/gyp,trafi/gyp,Jack-Q/GYP-copy,enkripsi/gyp,msc-/gyp,AOSPU/external_chromium_org_tools_gyp,cchamberlain/gyp,dougbeal/gyp,sloanyang/gyp,ttyangf/gyp,Jack-Q/GYP-copy,clar/gyp,cchamberlain/gyp,AOSPU/external_chromium_org_tools_gyp,mapbox/gyp,channing/gyp,lianliuwei/gyp,mkrautz/gyp-libmumble,carlTLR/gyp,luvit/gyp,LazyCodingCat/gyp,alexcrichton/gyp,mkrautz/gyp-libmumble,channing/gyp,Danath/gyp,brson/gyp,okwasi/gyp,cysp/gyp,duanhjlt/gyp,bulldy80/gyp_unofficial,cysp/gyp,erikge/watch_gyp,bdarnell/gyp,saghul/gyn,ttyangf/gyp,svn2github/gyp,mgamer/gyp,duanhjlt/gyp,bnoordhuis/gyp,cchamberlain/gyp,lukeweber/gyp-override,enkripsi/gyp,AWhetter/gyp,msc-/gyp,cysp/gyp,cysp/gyp,adblockplus/gyp,yjhjstz/gyp,mapbox/gyp,bnq4ever/gypgoogle,msc-/gyp,msc-/gyp,sloanyang/gyp,sport-monkey/GYP,amoikevin/gyp,ttyangf/gyp,cchamberlain/gyp,Danath/gyp,svn2github/gyp,alexcrichton/gyp,turbulenz/gyp,xin3liang/platform_external_chromium_org_tools_gyp,pyokagan/gyp,bnoordhuis/gyp,sfiera/gyp,kevinchen3315/gyp-git,ttyangf/gyp,lianliuwei/gyp,dougbeal/gyp,bdarnell/gyp,enkripsi/gyp,tarc/gyp,clar/gyp,yjhjstz/gyp,sport-monkey/GYP,IllusionRom-deprecated/android_platform_external_chromium_org_tools_gyp,sport-monkey/GYP,springmeyer/gyp,turbulenz/gyp,MIPS/external-chromium_org-tools-gyp,AWhetter/gyp,xin3liang/platform_external_chromium_org_tools_gyp,erikge/watch_gyp,Omegaphora/external_chromium_org_tools_gyp,pandaxcl/gyp,sdklite/gyp,okwasi/gyp