Consolidate manifest handler registration.

chrome/common/extensions/manifest_handlers/content_scripts_manifest_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 "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_manifest_constants.h"
 #include "chrome/common/extensions/manifest_handlers/content_scripts_handler.h"
 #include "chrome/common/extensions/manifest_tests/extension_manifest_test.h"
 #include "extensions/common/error_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace errors = extension_manifest_errors;
 
 namespace extensions {
 
 class ContentScriptsManifestTest : public ExtensionManifestTest {
- protected:
-  virtual void SetUp() OVERRIDE {
-    ExtensionManifestTest::SetUp();
-    (new ContentScriptsHandler)->Register();
-  }
 };
 
 TEST_F(ContentScriptsManifestTest, MatchPattern) {
   Testcase testcases[] = {
     // chrome:// urls are not allowed.
     Testcase("content_script_chrome_url_invalid.json",
              ErrorUtils::FormatErrorMessage(
                  errors::kInvalidMatch,
                  base::IntToString(0),
                  base::IntToString(0),
@@ skipping 31 matching lines @@
       ContentScriptsInfo::GetScriptableHosts(extension);
 
   URLPatternSet expected;
   expected.AddPattern(
       URLPattern(URLPattern::SCHEME_HTTP, "http://yahoo.com/*"));
 
   EXPECT_EQ(expected, scriptable_hosts);
 }
 
 }  // namespace extensions