aura: Make the Linux version of IconLoader not require GTK+.

chrome/chrome_browser.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': 'browser',
       'type': 'static_library',
       'dependencies': [
@@ skipping 1353 matching lines @@
         'browser/history/url_database.cc',
         'browser/history/url_database.h',
         'browser/history/visit_database.cc',
         'browser/history/visit_database.h',
         'browser/history/visit_tracker.cc',
         'browser/history/visit_tracker.h',
         'browser/history/visitsegment_database.cc',
         'browser/history/visitsegment_database.h',
         'browser/icon_loader.cc',
         'browser/icon_loader.h',
-        'browser/icon_loader_aura.cc',
-        'browser/icon_loader_gtk.cc',
+        'browser/icon_loader_linux.cc',
         'browser/icon_loader_mac.mm',
         'browser/icon_loader_win.cc',
         'browser/icon_manager.cc',
         'browser/icon_manager.h',
         'browser/icon_manager_linux.cc',
         'browser/icon_manager_mac.mm',
         'browser/icon_manager_win.cc',
         'browser/idle_chromeos.cc',
         'browser/idle_linux.cc',
         'browser/idle_mac.mm',
@@ skipping 3855 matching lines @@
       'type': 'static_library',
       'sources': [ 'browser/history/in_memory_url_index_cache.proto' ],
       'variables': {
         'proto_in_dir': 'browser/history',
         'proto_out_dir': 'chrome/browser/history',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }