Remove rendundant use of product_name in gyp files.

chrome/chrome_exe.gypi

 # Copyright (c) 2011 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.
 
 {
   'target_defaults': {
     'variables': {
       'chrome_exe_target': 0,
     },
     'target_conditions': [
@@ skipping 402 matching lines @@
             }],
             ['selinux==0', {
               'dependencies': [
                 '../sandbox/sandbox.gyp:sandbox',
               ],
             }],
           ],
         }],
         ['OS != "mac"', {
           'conditions': [
-            ['branding=="Chrome"', {
-              'product_name': 'chrome'
-            }, {  # else: Branding!="Chrome"
-              # TODO:  change to:
-              #   'product_name': 'chromium'
-              # whenever we convert the rest of the infrastructure
-              # (buildbots etc.) to use "gyp -Dbranding=Chrome".
-              # NOTE: chrome/app/theme/chromium/BRANDING and
-              # chrome/app/theme/google_chrome/BRANDING have the short names,
-              # etc.; should we try to extract from there instead?
-              'product_name': 'chrome'
-            }],
+            # TODO:  add a:
+            #   'product_name': 'chromium'
+            # whenever we convert the rest of the infrastructure
+            # (buildbots etc.) to understand the branding gyp define.
+            # NOTE: chrome/app/theme/chromium/BRANDING and
+            # chrome/app/theme/google_chrome/BRANDING have the short name
+            # "chrome" etc.; should we try to extract from there instead?
+
             # On Mac, this is done in chrome_dll.gypi.
             ['internal_pdf', {
               'dependencies': [
                 '../pdf/pdf.gyp:pdf',
               ],
             }],
           ],
           'dependencies': [
             'packed_extra_resources',
             # Copy Flash Player files to PRODUCT_DIR if applicable. Let the .gyp
@@ skipping 69 matching lines @@
           'configurations': {
             'Common_Base': {
               'msvs_target_platform': 'x64',
             },
           },
         },
       ],
     }],
   ],
 }