Move content settings extension API to content_settings dir.

chrome/browser/extensions/api/content_settings/content_settings_unittest.cc

 // 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.
 
 #include "testing/gtest/include/gtest/gtest.h"
 
-#include "chrome/browser/extensions/extension_content_settings_helpers.h"
+#include "chrome/browser/extensions/api/content_settings/content_settings_helpers.h"
 
-namespace helpers = extension_content_settings_helpers;
+namespace extensions {
+namespace helpers = content_settings_helpers;
 
 TEST(ExtensionContentSettingsHelpersTest, ParseExtensionPattern) {
   const struct {
     const char* extension_pattern;
     const char* content_settings_pattern;
   } kTestPatterns[] = {
     { "<all_urls>", "*" },
     { "*://*.google.com/*", "[*.]google.com" },
     { "http://www.example.com/*", "http://www.example.com" },
     { "*://www.example.com/*", "www.example.com" },
@@ skipping 20 matching lines @@
   };
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(kInvalidTestPatterns); ++i) {
     std::string error;
     ContentSettingsPattern pattern = helpers::ParseExtensionPattern(
         kInvalidTestPatterns[i].extension_pattern, &error);
     EXPECT_FALSE(pattern.IsValid());
     EXPECT_EQ(kInvalidTestPatterns[i].expected_error, error)
         << "Unexpected error parsing "
         << kInvalidTestPatterns[i].extension_pattern;
   }
+}
 
-}
+}  // namespace extensions