Remove files that don't exist, and fix typos in gyp files

content/content_common.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.
 
 {
   'targets': [
     {
       'target_name': 'content_common',
       'type': 'static_library',
       'dependencies': [
@@ skipping 102 matching lines @@
         'common/gpu/gpu_channel_manager.cc',
         'common/gpu/gpu_channel_manager.h',
         'common/gpu/gpu_command_buffer_stub.cc',
         'common/gpu/gpu_command_buffer_stub.h',
         'common/gpu/gpu_config.h',
         'common/gpu/gpu_feature_flags.cc',
         'common/gpu/gpu_feature_flags.h',
         'common/gpu/gpu_info.cc',
         'common/gpu/gpu_info.h',
         'common/gpu/gpu_messages.h',
-        'common/gpu/gpu_process_launch_casues.h',
+        'common/gpu/gpu_process_launch_causes.h',
         'common/gpu/gpu_video_decode_accelerator.cc',
         'common/gpu/gpu_video_decode_accelerator.h',
         'common/gpu/gpu_video_service.cc',
         'common/gpu/gpu_video_service.h',
         'common/gpu/gpu_watchdog.h',
         'common/gpu/media/gpu_video_device.h',
         'common/gpu/media/fake_gl_video_decode_engine.cc',
         'common/gpu/media/fake_gl_video_decode_engine.h',
         'common/gpu/media/fake_gl_video_device.cc',
         'common/gpu/media/fake_gl_video_device.h',
@@ skipping 150 matching lines @@
         }],
         ['enable_gpu==1', {
           'dependencies': [
             '../gpu/gpu.gyp:command_buffer_service',
           ],
         }],
       ],
     },
   ],
 }