[iOS] ios/web no longer depends on content::BrowserThread.

ios/web/test/test_web_thread_adapter.cc

-// Copyright 2014 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 "ios/web/public/test/test_web_thread.h"
-
-#include "content/public/test/test_browser_thread.h"
-#include "ios/web/web_thread_adapter.h"
-
-namespace web {
-
-// TestWebThreadImpl delegates to content::TestBrowserThread until WebThread
-// implementation is indenpendent of content::BrowserThread.
-class TestWebThreadImpl {
- public:
-  TestWebThreadImpl(WebThread::ID identifier)
-      : test_browser_thread_(BrowserThreadIDFromWebThreadID(identifier)) {}
-
-  TestWebThreadImpl(WebThread::ID identifier, base::MessageLoop* message_loop)
-      : test_browser_thread_(BrowserThreadIDFromWebThreadID(identifier),
-                             message_loop) {}
-
-  ~TestWebThreadImpl() { Stop(); }
-
-  bool Start() { return test_browser_thread_.Start(); }
-
-  bool StartIOThread() { return test_browser_thread_.StartIOThread(); }
-
-  void Stop() { test_browser_thread_.Stop(); }
-
-  bool IsRunning() { return test_browser_thread_.IsRunning(); }
-
- private:
-  content::TestBrowserThread test_browser_thread_;
-};
-
-TestWebThread::TestWebThread(WebThread::ID identifier)
-    : impl_(new TestWebThreadImpl(identifier)) {
-}
-
-TestWebThread::TestWebThread(WebThread::ID identifier,
-                             base::MessageLoop* message_loop)
-    : impl_(new TestWebThreadImpl(identifier, message_loop)) {
-}
-
-TestWebThread::~TestWebThread() {
-}
-
-bool TestWebThread::Start() {
-  return impl_->Start();
-}
-
-bool TestWebThread::StartIOThread() {
-  return impl_->StartIOThread();
-}
-
-void TestWebThread::Stop() {
-  impl_->Stop();
-}
-
-bool TestWebThread::IsRunning() {
-  return impl_->IsRunning();
-}
-
-}  // namespace web