Remove PRODUCT_STRING_PATH from chrome_constants.h on Windows.

chrome/common_constants.gyp

Index: chrome/common_constants.gyp
diff --git a/chrome/common_constants.gyp b/chrome/common_constants.gyp
index cf315ca0c885143f653197c7e30a08c970617603..ec38879fc45e7185aee999a53cbce136b1b17272 100644
--- a/chrome/common_constants.gyp
+++ b/chrome/common_constants.gyp
@@ -8,6 +8,8 @@
     'common_constants_sources': [
       'common/chrome_constants.cc',
       'common/chrome_constants.h',
+      'common/chrome_constants_util_win.cc',
+      'common/chrome_constants_util_win.h',
       'common/chrome_features.cc',
       'common/chrome_features.h',
       'common/chrome_icon_resources_win.cc',
@@ -96,6 +98,11 @@
           'sources/': [
             ['include', '^common/chrome_paths_mac\\.mm$'],
           ],
+        },
+        'OS=="win"', {
+          'dependencies': [
+            'installer_util',

[grt (UTC plus 2), 2016/03/08 15:44:47]

you'll minimally need a win-specific includes section that includes
chrome_installer_util.gypi for this to work. i'm not sure if more will be
needed.

+          ],
         }],
       ],
       'conditions': [
@@ -121,6 +128,7 @@
             '<(SHARED_INTERMEDIATE_DIR)',  # Needed by chrome_paths.cc.
           ],
           'dependencies': [
+            'installer_util',
             'version_header',
             'chrome_features.gyp:chrome_common_features',
             '../base/base.gyp:base_win64',