New VS 2015 package with two hot fixes

build/vs_toolchain.py

Index: build/vs_toolchain.py
diff --git a/build/vs_toolchain.py b/build/vs_toolchain.py
index 6ed55997ff118176f157ebf0a57912dd2f26b54f..43990634e77f1463cffa040b2de4838f2a086bb2 100755
--- a/build/vs_toolchain.py
+++ b/build/vs_toolchain.py
@@ -278,8 +278,8 @@ def _GetDesiredVsToolchainHashes():
   """Load a list of SHA1s corresponding to the toolchains that we want installed
   to build with."""
   if GetVisualStudioVersion() == '2015':
-    # Update 1 with Debuggers, UCRT installers and ucrtbased.dll
-    return ['523b6c2d3df300b2c8538cdc0beac404726af051']
+    # Update 1 with hot fixes.
+    return ['b349b3cc596d5f7e13d649532ddd7e8db39db0cb']
   else:
     # Default to VS2013.
     return ['4087e065abebdca6dbd0caca2910c6718d2ec67f']