Cleanup GtkIMContext related code by splitting it into separated source file.

chrome/chrome.gyp

 # Copyright (c) 2009 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.
 
 {
   'variables': {
     'chromium_code': 1,
     # Define the common dependencies that contain all the actual
     # Chromium functionality.  This list gets pulled in below by
     # the link of the actual chrome (or chromium) executable on
@@ skipping 1451 matching lines @@
         'browser/renderer_host/cross_site_resource_handler.cc',
         'browser/renderer_host/cross_site_resource_handler.h',
         'browser/renderer_host/database_dispatcher_host.cc',
         'browser/renderer_host/database_dispatcher_host.h',
         'browser/renderer_host/download_resource_handler.cc',
         'browser/renderer_host/download_resource_handler.h',
         'browser/renderer_host/download_throttling_resource_handler.cc',
         'browser/renderer_host/download_throttling_resource_handler.h',
         'browser/renderer_host/file_system_accessor.cc',
         'browser/renderer_host/file_system_accessor.h',
+        'browser/renderer_host/gtk_im_context_wrapper.cc',
+        'browser/renderer_host/gtk_im_context_wrapper.h',
         'browser/renderer_host/render_process_host.cc',
         'browser/renderer_host/render_process_host.h',
         'browser/renderer_host/render_sandbox_host_linux.h',
         'browser/renderer_host/render_sandbox_host_linux.cc',
         'browser/renderer_host/render_view_host.cc',
         'browser/renderer_host/render_view_host.h',
         'browser/renderer_host/render_view_host_delegate.cc',
         'browser/renderer_host/render_view_host_delegate.h',
         'browser/renderer_host/render_view_host_factory.cc',
         'browser/renderer_host/render_view_host_factory.h',
@@ skipping 3791 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],  # 'actions'
         },
       ]
     }],
   ],  # 'conditions'
 }