Removes unconditionally added chrome_run

It's no longer necessary as I fixed the underlying bug in the recipe
side.

BUG=407419
TEST=none
R=jam@chromium.org
TBR=jam@chromium.org

Review URL: https://codereview.chromium.org/507853002

Cr-Commit-Position: refs/heads/master@{#292043}

chrome/chrome_exe.gypi

@@ -697,16 +697,6 @@
             }],
           ],
         },
-    ]}, {
-      # Used by bots so they can always depend on chrome_run target.
-      'targets': [
-        {
-          'target_name': 'chrome_run',
-          'type': 'none',
-          'dependencies': [
-            'chrome',
-          ],
-        },
       ],
     }],
   ],