Fix some erroneous "(c)"'s in copyright messages.

mojo/mojo_converters.gypi

-# Copyright (c) 2014 The Chromium Authors. All rights reserved.
+# Copyright 2014 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': [
     {
       # GN version: //mojo/converters/input_events
       'target_name': 'mojo_input_events_lib',
       'type': '<(component)',
       'defines': [
@@ skipping 119 matching lines @@
       'conditions': [
         ['component=="shared_library"', {
           'dependencies': [
             'mojo_base.gyp:mojo_environment_chromium',
           ],
         }],
       ],
     },
   ],
 }