Fix error message when using exclusion
Fix error message when using exclusion

Patch by Sylvain Defresne <sdefresne@chromium.org>

Review URL: https://codereview.chromium.org/64633003/


git-svn-id: e7e1075985beda50ea81ac4472467b4f6e91fc78@1786 78cadc50-ecff-11dd-a971-7dbc132099af

omasanori/gyp,bnoordhuis/gyp,svn2github/kgyp,mistydemeo/gyp,ttyangf/gyp,luvit/gyp,Jack-Q/GYP-copy,AWhetter/gyp,sport-monkey/GYP,pandaxcl/gyp,bulldy80/gyp_unofficial,Jack-Q/GYP-copy,LazyCodingCat/gyp,dougbeal/gyp,msc-/gyp,azunite/gyp,Chilledheart/gyp,sdklite/gyp,Phuehvk/gyp,svn2github/gyp,Chilledheart/gyp,openpeer/webrtc-gyp,ttyangf/pdfium_gyp,Danath/gyp,Danath/gyp,amoikevin/gyp,trafi/gyp,tarc/gyp,trafi/gyp,yjhjstz/gyp,saghul/gyn,svn2github/gyp,omasanori/gyp,Phuehvk/gyp,chromium/gyp,ttyangf/gyp,ttyangf/pdfium_gyp,cysp/gyp,pyokagan/gyp,enkripsi/gyp,cchamberlain/gyp,pyokagan/gyp,mistydemeo/gyp,sdklite/gyp,clar/gyp,bulldy80/gyp_unofficial,adblockplus/gyp,erikge/watch_gyp,cchamberlain/gyp,bulldy80/gyp_unofficial,ryfx/gyp,dougbeal/gyp,android-ia/platform_external_chromium_org_tools_gyp,AOSPU/external_chromium_org_tools_gyp,okumura/gyp,enkripsi/gyp,okumura/gyp,Jack-Q/GYP-copy,azunite/gyp_20150930,mgamer/gyp,msc-/gyp,dougbeal/gyp,LazyCodingCat/gyp,ttyangf/gyp,AWhetter/gyp,mgamer/gyp,bnq4ever/gypgoogle,bnoordhuis/gyp,trafi/gyp,carlTLR/gyp,yinquan529/platform-external-chromium_org-tools-gyp,amoikevin/gyp,Phuehvk/gyp,LazyCodingCat/gyp,springmeyer/gyp,ryfx/gyp,ryfx/gyp,bulldy80/gyp_unofficial,enkripsi/gyp,bnoordhuis/gyp,luvit/gyp,xin3liang/platform_external_chromium_org_tools_gyp,Omegaphora/external_chromium_org_tools_gyp,mapbox/gyp,mapbox/gyp,turbulenz/gyp,AWhetter/gyp,xin3liang/platform_external_chromium_org_tools_gyp,amoikevin/gyp,adblockplus/gyp,alexcrichton/gyp,bnoordhuis/gyp,omasanori/gyp,springmeyer/gyp,Jack-Q/GYP-copy,LazyCodingCat/gyp,adblockplus/gyp,cysp/gyp,sport-monkey/GYP,clar/gyp,alexcrichton/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,openpeer/webrtc-gyp,chromium/gyp,sanyaade-teachings/gyp,ttyangf/pdfium_gyp,bnq4ever/gypgoogle,erikge/watch_gyp,luvit/gyp,openpeer/webrtc-gyp,azunite/gyp,azunite/gyp,carlTLR/gyp,bulldy80/gyp_unofficial,mapbox/gyp,ttyangf/pdfium_gyp,mistydemeo/gyp,msc-/gyp,pandaxcl/gyp,trafi/gyp,Omegaphora/external_chromium_org_tools_gyp,Phuehvk/gyp,omasanori/gyp,pyokagan/gyp,mistydemeo/gyp,mgamer/gyp,alexcrichton/gyp,ttyangf/gyp,cysp/gyp,yjhjstz/gyp,sdklite/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,sport-monkey/GYP,erikge/watch_gyp,enkripsi/gyp,enkripsi/gyp,AOSPU/external_chromium_org_tools_gyp,bnoordhuis/gyp,saghul/gyn,bnq4ever/gypgoogle,azunite/gyp_20150930,Phuehvk/gyp,turbulenz/gyp,erikge/watch_gyp,clar/gyp,azunite/gyp_20150930,openpeer/webrtc-gyp,bpsinc-native/src_tools_gyp,tarc/gyp,clar/gyp,xin3liang/platform_external_chromium_org_tools_gyp,okumura/gyp,sport-monkey/GYP,saghul/gyn,adblockplus/gyp,pandaxcl/gyp,chromium/gyp,ttyangf/gyp,yinquan529/platform-external-chromium_org-tools-gyp,cchamberlain/gyp,android-ia/platform_external_chromium_org_tools_gyp,amoikevin/gyp,bnq4ever/gypgoogle,azunite/gyp_20150930,sanyaade-teachings/gyp,saghul/gyn,tarc/gyp,duanhjlt/gyp,yjhjstz/gyp,okumura/gyp,alexcrichton/gyp,chromium/gyp,svn2github/kgyp,carlTLR/gyp,sdklite/gyp,amoikevin/gyp,Jack-Q/GYP-copy,android-ia/platform_external_chromium_org_tools_gyp,Chilledheart/gyp,duanhjlt/gyp,msc-/gyp,turbulenz/gyp,Chilledheart/gyp,Danath/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,turbulenz/gyp,duanhjlt/gyp,Omegaphora/external_chromium_org_tools_gyp,android-ia/platform_external_chromium_org_tools_gyp,Danath/gyp,geekboxzone/lollipop_external_chromium_org_tools_gyp,sport-monkey/GYP,springmeyer/gyp,cysp/gyp,xin3liang/platform_external_chromium_org_tools_gyp,saghul/gyn,sanyaade-teachings/gyp,openpeer/webrtc-gyp,chromium/gyp,AOSPU/external_chromium_org_tools_gyp,cysp/gyp,dougbeal/gyp,pandaxcl/gyp,bnq4ever/gypgoogle,LazyCodingCat/gyp,duanhjlt/gyp,carlTLR/gyp,Omegaphora/external_chromium_org_tools_gyp,svn2github/gyp,dougbeal/gyp,svn2github/gyp,erikge/watch_gyp,Chilledheart/gyp,bpsinc-native/src_tools_gyp,bpsinc-native/src_tools_gyp,yinquan529/platform-external-chromium_org-tools-gyp,azunite/gyp_20150930,pyokagan/gyp,yjhjstz/gyp,svn2github/kgyp,clar/gyp,AWhetter/gyp,turbulenz/gyp,azunite/gyp,luvit/gyp,tarc/gyp,yjhjstz/gyp,Danath/gyp,mapbox/gyp,sdklite/gyp,sanyaade-teachings/gyp,azunite/gyp,cchamberlain/gyp,svn2github/kgyp,ryfx/gyp,AWhetter/gyp,mapbox/gyp,carlTLR/gyp,svn2github/kgyp,mgamer/gyp,trafi/gyp,adblockplus/gyp,tarc/gyp,AOSPU/external_chromium_org_tools_gyp,yinquan529/platform-external-chromium_org-tools-gyp,pyokagan/gyp,pandaxcl/gyp,springmeyer/gyp,ryfx/gyp,svn2github/gyp,sanyaade-teachings/gyp,springmeyer/gyp,msc-/gyp,bpsinc-native/src_tools_gyp,ttyangf/pdfium_gyp,cchamberlain/gyp,duanhjlt/gyp,mgamer/gyp