Change default Windows compiler to VS 2015

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 846dc3af5557a530887958f9b79d41945b1830bb..f813c80e61e74cd0108fd90ae3df68a34c737a00 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -5672,11 +5672,13 @@
             ],
           }],
         ],
+        # Add extra include directories here that need to be in front of the
+        # installed and packaged include directories. This may be needed in
+        # order to force a particular SDK version, such as to get VS 2013 to use
+        # the Windows 10 SDK. Beware of making the INCLUDE variable excessively
+        # long, and be sure to make corresponding changes to
+        # build\toolchain\win\setup_toolchain.py
         'msvs_system_include_dirs': [
-          '<(windows_sdk_path)/Include/10.0.10586.0/shared',

[scottmg, 2016/02/05 21:52:45]

Won't these be needed for DEPOT_TOOLS_WIN_TOOLCHAIN=0?

[brucedawson, 2016/02/05 22:28:19]

Only with VS 2013, which this switches away from (commenting here for
posterity).

-          '<(windows_sdk_path)/Include/10.0.10586.0/um',
-          '<(windows_sdk_path)/Include/10.0.10586.0/winrt',
-          '$(VSInstallDir)/VC/atlmfc/include',
         ],
         'msvs_cygwin_shell': 0,
         'msvs_disabled_warnings': [