Enable VS2013 for Windows compilation by default.
Enable VS2013 for Windows compilation by default.

BUG=chromium:340973
TEST=All trybots passing runhooks and compile step (needs clobber flag -c to ensure old compile output doesn't cause it to fail). I also ran all the tests for the Windows trybots, which passed.
R=tommi@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/9769004

git-svn-id: 03ae4fbe531b1eefc9d815f31e49022782c42458@5687 4adac7df-926f-26a2-2b94-8c16560cd09d

xin3liang/platform_external_chromium_org_third_party_webrtc,CyanogenMod/android_external_chromium_org_third_party_webrtc,aleonliao/webrtc-trunk,sippet/webrtc,sippet/webrtc,bpsinc-native/src_third_party_webrtc,geekboxzone/lollipop_external_chromium_org_third_party_webrtc,bpsinc-native/src_third_party_webrtc,krieger-od/nwjs_chromium_webrtc,Omegaphora/external_chromium_org_third_party_webrtc,SlimXperiments/external_chromium_org_third_party_webrtc,svn2github/webrtc-Revision-8758,PersonifyInc/chromium_webrtc,PersonifyInc/chromium_webrtc,jgcaaprom/android_external_chromium_org_third_party_webrtc,MIPS/external-chromium_org-third_party-webrtc,bpsinc-native/src_third_party_webrtc,aleonliao/webrtc-trunk,bpsinc-native/src_third_party_webrtc,krieger-od/nwjs_chromium_webrtc,jgcaaprom/android_external_chromium_org_third_party_webrtc,CyanogenMod/android_external_chromium_org_third_party_webrtc,MIPS/external-chromium_org-third_party-webrtc,aleonliao/webrtc-trunk,jgcaaprom/android_external_chromium_org_third_party_webrtc,CyanogenMod/android_external_chromium_org_third_party_webrtc,android-ia/platform_external_chromium_org_third_party_webrtc,SlimXperiments/external_chromium_org_third_party_webrtc,jchavanton/webrtc,AOSPU/external_chromium_org_third_party_webrtc,PersonifyInc/chromium_webrtc,xin3liang/platform_external_chromium_org_third_party_webrtc,AOSPU/external_chromium_org_third_party_webrtc,Omegaphora/external_chromium_org_third_party_webrtc,AOSPU/external_chromium_org_third_party_webrtc,MIPS/external-chromium_org-third_party-webrtc,Alkalyne/webrtctrunk,xin3liang/platform_external_chromium_org_third_party_webrtc,Alkalyne/webrtctrunk,jgcaaprom/android_external_chromium_org_third_party_webrtc,SlimXperiments/external_chromium_org_third_party_webrtc,SlimXperiments/external_chromium_org_third_party_webrtc,android-ia/platform_external_chromium_org_third_party_webrtc,sippet/webrtc,Alkalyne/webrtctrunk,krieger-od/webrtc,krieger-od/nwjs_chromium_webrtc,MIPS/external-chromium_org-third_party-webrtc,krieger-od/webrtc,bpsinc-native/src_third_party_webrtc,svn2github/webrtc-Revision-8758,geekboxzone/lollipop_external_chromium_org_third_party_webrtc,xin3liang/platform_external_chromium_org_third_party_webrtc,SlimXperiments/external_chromium_org_third_party_webrtc,krieger-od/webrtc,Alkalyne/webrtctrunk,svn2github/webrtc-Revision-8758,sippet/webrtc,jchavanton/webrtc,aleonliao/webrtc-trunk,MIPS/external-chromium_org-third_party-webrtc,PersonifyInc/chromium_webrtc,CyanogenMod/android_external_chromium_org_third_party_webrtc,PersonifyInc/chromium_webrtc,sippet/webrtc,jgcaaprom/android_external_chromium_org_third_party_webrtc,AOSPU/external_chromium_org_third_party_webrtc,jchavanton/webrtc,jchavanton/webrtc,android-ia/platform_external_chromium_org_third_party_webrtc,aleonliao/webrtc-trunk,Omegaphora/external_chromium_org_third_party_webrtc,Omegaphora/external_chromium_org_third_party_webrtc,AOSPU/external_chromium_org_third_party_webrtc,SlimXperiments/external_chromium_org_third_party_webrtc,Omegaphora/external_chromium_org_third_party_webrtc,geekboxzone/lollipop_external_chromium_org_third_party_webrtc,Alkalyne/webrtctrunk,geekboxzone/lollipop_external_chromium_org_third_party_webrtc,svn2github/webrtc-Revision-8758,geekboxzone/lollipop_external_chromium_org_third_party_webrtc,AOSPU/external_chromium_org_third_party_webrtc,jchavanton/webrtc,android-ia/platform_external_chromium_org_third_party_webrtc,bpsinc-native/src_third_party_webrtc,krieger-od/webrtc,bpsinc-native/src_third_party_webrtc,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,krieger-od/webrtc,jgcaaprom/android_external_chromium_org_third_party_webrtc,AOSPU/external_chromium_org_third_party_webrtc,xin3liang/platform_external_chromium_org_third_party_webrtc,android-ia/platform_external_chromium_org_third_party_webrtc,Omegaphora/external_chromium_org_third_party_webrtc,aleonliao/webrtc-trunk,krieger-od/nwjs_chromium_webrtc,xin3liang/platform_external_chromium_org_third_party_webrtc,krieger-od/nwjs_chromium_webrtc,jchavanton/webrtc,Omegaphora/external_chromium_org_third_party_webrtc,MIPS/external-chromium_org-third_party-webrtc,xin3liang/platform_external_chromium_org_third_party_webrtc,krieger-od/webrtc,SlimXperiments/external_chromium_org_third_party_webrtc,CyanogenMod/android_external_chromium_org_third_party_webrtc,CyanogenMod/android_external_chromium_org_third_party_webrtc,android-ia/platform_external_chromium_org_third_party_webrtc,Alkalyne/webrtctrunk,bpsinc-native/src_third_party_webrtc,jchavanton/webrtc,svn2github/webrtc-Revision-8758,sippet/webrtc,krieger-od/nwjs_chromium_webrtc,svn2github/webrtc-Revision-8758,jgcaaprom/android_external_chromium_org_third_party_webrtc,android-ia/platform_external_chromium_org_third_party_webrtc,MIPS/external-chromium_org-third_party-webrtc,MIPS/external-chromium_org-third_party-webrtc,geekboxzone/lollipop_external_chromium_org_third_party_webrtc,CyanogenMod/android_external_chromium_org_third_party_webrtc,PersonifyInc/chromium_webrtc,geekboxzone/lollipop_external_chromium_org_third_party_webrtc,android-ia/platform_external_chromium_org_third_party_webrtc,jgcaaprom/android_external_chromium_org_third_party_webrtc,Omegaphora/external_chromium_org_third_party_webrtc,geekboxzone/lollipop_external_chromium_org_third_party_webrtc