trial run of vs2013 with iterator debugging off to see if browser_tests are timing-related

BUG=

Review URL: https://codereview.chromium.org/165693005

git-svn-id: http://src.chromium.org/svn/trunk/src/build@252837 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -2054,7 +2054,7 @@
       # instead of O(N*logN). This is particularly slow under memory
       # tools like ThreadSanitizer so we want it to be disablable.
       # See http://msdn.microsoft.com/en-us/library/aa985982(v=VS.80).aspx
-      'win_debug_disable_iterator_debugging%': '0',
+      'win_debug_disable_iterator_debugging%': '1',
 
       # An application manifest fragment to declare compatibility settings for
       # 'executable' targets. Ignored in other target type.

gyp_chromium

@@ -458,7 +458,7 @@ if __name__ == '__main__':
   vs2013_runtime_dll_dirs = None
   # TODO(scottmg): Temporarily default to off, see http://crbug.com/345993.
   depot_tools_win_toolchain = \
-      bool(int(os.environ.get('DEPOT_TOOLS_WIN_TOOLCHAIN', '0')))
+      bool(int(os.environ.get('DEPOT_TOOLS_WIN_TOOLCHAIN', '1')))
   if sys.platform in ('win32', 'cygwin') and depot_tools_win_toolchain:
     import find_depot_tools
     depot_tools_path = find_depot_tools.add_depot_tools_to_path()