Switch to VS 2015 Update 3

build/vs_toolchain.py

Index: build/vs_toolchain.py
diff --git a/build/vs_toolchain.py b/build/vs_toolchain.py
index 829e718025cf601177c666470789c67aaef0d73b..9c55984e2f698b903b6c7a57fa51847ee81cf55f 100755
--- a/build/vs_toolchain.py
+++ b/build/vs_toolchain.py
@@ -305,12 +305,8 @@ def _GetDesiredVsToolchainHashes():
   """Load a list of SHA1s corresponding to the toolchains that we want installed
   to build with."""
   if GetVisualStudioVersion() == '2015':
-    if bool(int(os.environ.get('DEPOT_TOOLS_WIN_TOOLCHAIN_PRERELEASE', '0'))):
-      # Update 3 final with patches.
-      return ['d5dc33b15d1b2c086f2f6632e2fd15882f80dbd3']
-    else:
-      # Update 2.
-      return ['95ddda401ec5678f15eeed01d2bee08fcbc5ee97']
+    # Update 3 final with patches with 10.0.10586.0 SDK.
+    return ['d5dc33b15d1b2c086f2f6632e2fd15882f80dbd3']
   else:
     return ['03a4e939cd325d6bc5216af41b92d02dda1366a6']