Update the depot_tools version of VS 2015 to Update 1

build/vs_toolchain.py

Index: build/vs_toolchain.py
diff --git a/build/vs_toolchain.py b/build/vs_toolchain.py
index d6473d7fe74abd5a4d1d78222ae5e76be365b861..e53eab5f2c0e175b19e525c392ecfe8bc8465bae 100755
--- a/build/vs_toolchain.py
+++ b/build/vs_toolchain.py
@@ -195,7 +195,7 @@ def _GetDesiredVsToolchainHashes():
   """Load a list of SHA1s corresponding to the toolchains that we want installed
   to build with."""
   if os.environ.get('GYP_MSVS_VERSION') == '2015':
-    return ['581a25d2e438bb208c1e28f0e901c2318d3ebdd7'] # Update 1
+    return ['8c3265958030a53f93f9cf027cfa5d5d9717fbf6'] # Update 1
   else:
     # Default to VS2013.
     return ['9ff97c632ae1fee0c98bcd53e71770eb3a0d8deb']