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

base/files/file_path_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 "base/basictypes.h"
 #include "base/files/file_path.h"
-#include "base/utf_string_conversions.h"
+#include "base/strings/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/platform_test.h"
 
 // This macro helps avoid wrapped lines in the test structs.
 #define FPL(x) FILE_PATH_LITERAL(x)
 
 // This macro constructs strings which can contain NULs.
 #define FPS(x) FilePath::StringType(FPL(x), arraysize(FPL(x)) - 1)
 
 namespace base {
@@ skipping 1204 matching lines @@
     { FPL("foo/"), FPL("foo/") }
   };
   for (size_t i = 0; i < arraysize(cases); ++i) {
     FilePath input = FilePath(cases[i].input).NormalizePathSeparators();
     FilePath expected = FilePath(cases[i].expected).NormalizePathSeparators();
     EXPECT_EQ(expected.value(), input.AsEndingWithSeparator().value());
   }
 }
 
 }  // namespace base