Makes sure chrome_run target is always present

chrome/chrome_exe.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.
 
 {
   'targets': [
     {
       'target_name': 'chrome',
       'type': 'none',
       'dependencies': [ 'chrome_initial', ],
@@ skipping 679 matching lines @@
             'chrome.isolate',
           ],
           'conditions': [
             ['OS=="win"', {
               'dependencies': [
                 'chrome_nacl_win64',
               ],
             }],
           ],
         },
+    ]}, {
+      # Used by bots so they can always depend on chrome_run target.
+      'targets': [
+        {
+          'target_name': 'chrome_run',
+          'type': 'none',
+          'dependencies': [
+            'chrome',
+          ],
+        },
       ],
     }],
   ],
 }