Use msvs toolchain from depot_tools.

DEPS

Index: DEPS
diff --git a/DEPS b/DEPS
index e35c74cd5b241294649423e6a98477f70232ae41..88b47e85d174eb4aff00a054f90fc93e313a17c5 100644
--- a/DEPS
+++ b/DEPS
@@ -134,6 +134,12 @@ hooks = [
                 '-d', 'v8/tools/luci-go/linux64',
     ],
   },
+  {
+    # Update the Windows toolchain if necessary.
+    'name': 'win_toolchain',
+    'pattern': '.',
+    'action': ['python', 'v8/build/vs_toolchain.py', 'update'],
+  },
   # Pull binutils for linux, enabled debug fission for faster linking /
   # debugging when used with clang on Ubuntu Precise.
   # https://code.google.com/p/chromium/issues/detail?id=352046