Add a Content API around BrowserChildProcessHost, similar to what was done with ChildProcessHost....

chrome/browser/intents/web_intents_registry_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 "base/file_util.h"
 #include "base/json/json_value_serializer.h"
+#include "base/message_loop.h"
 #include "base/path_service.h"
 #include "base/scoped_temp_dir.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/extensions/test_extension_service.h"
 #include "chrome/browser/intents/web_intents_registry.h"
 #include "chrome/browser/webdata/web_data_service.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/extensions/extension_set.h"
 #include "content/test/test_browser_thread.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 302 matching lines @@
   consumer.expected_id_ = registry_.GetIntentProviders(
       ASCIIToUTF16("http://webintents.org/share"),
       ASCIIToUTF16("*"), &consumer);
   consumer.WaitForData();
   ASSERT_EQ(4U, consumer.services_.size());
   EXPECT_EQ(services[0], consumer.services_[0]);
   EXPECT_EQ(services[1], consumer.services_[1]);
   EXPECT_EQ(services[2], consumer.services_[2]);
   EXPECT_EQ(services[3], consumer.services_[3]);
 }