Avoid basename conflict in text_composition

ui/base/ime/ui_base_ime.gyp

 # Copyright 2015 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,
   },
   'targets': [
     {
@@ skipping 17 matching lines @@
       'defines': [
         'UI_BASE_IME_IMPLEMENTATION',
       ],
       'sources' : [
         'candidate_window.cc',
         'candidate_window.h',
         'chromeos/character_composer.cc',
         'chromeos/character_composer.h',
         'chromeos/component_extension_ime_manager.cc',
         'chromeos/component_extension_ime_manager.h',
-        'chromeos/composition_text.cc',
-        'chromeos/composition_text.h',
+        'chromeos/composition_text_chromeos.cc',
+        'chromeos/composition_text_chromeos.h',
         'chromeos/extension_ime_util.cc',
         'chromeos/extension_ime_util.h',
         'chromeos/fake_ime_keyboard.cc',
         'chromeos/fake_ime_keyboard.h',
         'chromeos/fake_input_method_delegate.cc',
         'chromeos/fake_input_method_delegate.h',
         'chromeos/ime_bridge.cc',
         'chromeos/ime_bridge.h',
         'chromeos/ime_keyboard.cc',
         'chromeos/ime_keyboard.h',
@@ skipping 127 matching lines @@
         ['use_x11==0', {
           'sources!': [
             'composition_text_util_pango.cc',
             'composition_text_util_pango.h',
           ],
         }],
       ],
     },
   ],
 }