Remove GYP execution in DEPS runhooks

GYP is deprecated and execution will break soon, so
remove it from executing during runhooks already.

BUG=libyuv:674

Change-Id: If8b7b97d719b85e4b5658fb82fe5ae940e8ceaa3
Reviewed-on: https://chromium-review.googlesource.com/433877Reviewed-by: Frank Barchard <fbarchard@google.com>
Commit-Queue: Frank Barchard <fbarchard@google.com>

DEPS

@@ -49,9 +49,4 @@ hooks = [
         Var('root_dir'),
     ],
   },
-  {
-    # A change to a .gyp, .gypi, or to GYP itself should run the generator.
-    'pattern': '.',
-    'action': ['python', Var('root_dir') + '/gyp_libyuv'],
-  },
 ]