Use a direct include of utf_string_conversions.h in android_webview/, apps/, ash/, base/.

ash/system/tray/system_tray_unittest.cc

 // Copyright (c) 2012 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.
 
 #include "ash/system/tray/system_tray.h"
 
 #include <vector>
 
 #include "ash/root_window_controller.h"
 #include "ash/shelf/shelf_widget.h"
 #include "ash/shell.h"
 #include "ash/system/status_area_widget.h"
 #include "ash/system/tray/system_tray_item.h"
 #include "ash/test/ash_test_base.h"
-#include "base/utf_string_conversions.h"
+#include "base/strings/utf_string_conversions.h"
 #include "ui/views/controls/label.h"
 #include "ui/views/layout/fill_layout.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
 #if defined(OS_WIN)
 #include "base/win/windows_version.h"
 #endif
 
 namespace ash {
@@ skipping 297 matching lines @@
   // Test in the right alignment. Right and bottom edges should match.
   widget->SetShelfAlignment(SHELF_ALIGNMENT_LEFT);
   window_bounds = widget->GetWindowBoundsInScreen();
   tray_bounds = tray->GetBoundsInScreen();
   EXPECT_EQ(window_bounds.bottom(), tray_bounds.bottom());
   EXPECT_EQ(window_bounds.right(), tray_bounds.right());
 }
 
 }  // namespace test
 }  // namespace ash