DevTools: move DevToolsAgent/Client into content.

BUG=84078
TEST=

Review URL: http://codereview.chromium.org/7461019

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@93596 0039d316-1c4b-4281-b951-d872f2087c98
  virtual void Init() {
#if defined(OS_WIN)
    CoInitialize(NULL);
#endif

    render_process_ = new RenderProcessImpl();
    render_process_->set_main_thread(new RenderThread(channel_id_));
    base::Thread::SetThreadWasQuitProperly(true);
  }

  virtual void Init() {
#if defined(OS_WIN)
    CoInitialize(NULL);
#endif

    render_process_ = new RenderProcessImpl();
    render_process_->set_main_thread(new RenderThread(channel_id_));
    base::Thread::SetThreadWasQuitProperly(true);
  }
