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

build/common.gypi

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 2036 matching lines @@
 
       # See http://msdn.microsoft.com/en-us/library/47238hez(VS.71).aspx
       'win_debug_InlineFunctionExpansion%': '',    # empty = default, 0 = off,
       'win_release_InlineFunctionExpansion%': '2', # 1 = only __inline, 2 = max
 
       # VS inserts quite a lot of extra checks to algorithms like
       # std::partial_sort in Debug build which make them O(N^2)
       # 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.
       'win_exe_compatibility_manifest%':
           '<(DEPTH)\\build\\win\\compatibility.manifest',
 
       # Set to 1 to generate external manifest instead of embedding it for
       # 'executable' target. Does nothing for other target type. This flag is
       # used to make mini_installer compatible with the component build.
       # See http://crbug.com/127233
@@ skipping 2966 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }