Move remaining non-test, non-Chrome-specific Prefs code to base/prefs/.

chrome/browser/chromeos/drive/search_metadata_unittest.cc

 // Copyright (c) 2013 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 "chrome/browser/chromeos/drive/search_metadata.h"
 
 #include "base/message_loop.h"
+#include "base/prefs/pref_service.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "chrome/browser/chromeos/drive/drive_file_system.h"
 #include "chrome/browser/chromeos/drive/drive_test_util.h"
 #include "chrome/browser/google_apis/fake_drive_service.h"
-#include "chrome/browser/prefs/pref_service.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/testing_profile.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/test/test_browser_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace drive {
 
 namespace {
 const int kDefaultAtMostNumMatches = 10;
@@ skipping 267 matching lines @@
   EXPECT_EQ("&lt;<b>hello</b>&gt;", highlighted_text);
 }
 
 TEST(SearchMetadataSimpleTest, FindAndHighlight_MoreMetaChars) {
   std::string highlighted_text;
   EXPECT_TRUE(FindAndHighlight("a&b&c&d", "b&c", &highlighted_text));
   EXPECT_EQ("a&amp;<b>b&amp;c</b>&amp;d", highlighted_text);
 }
 
 }   // namespace drive