Revert of Ensure that modal dialogs from subframes can be cleaned up correctly.

Revert of Ensure that modal dialogs from subframes can be cleaned up correctly. (https://codereview.chromium.org/255543009/)

Reason for revert:
Causes leaks:

http://build.chromium.org/p/chromium.memory/builders/Linux%20ASan%20LSan%20Tests%20%282%29/builds/2046/steps/browser_tests/logs/SadTabCancelsSubframeDialogs

Direct leak of 48 byte(s) in 1 object(s) allocated from:
    #0 0x56973b in operator new(unsigned long) /usr/local/google/work/chromium/src/third_party/llvm/projects/compiler-rt/lib/asan/asan_new_delete.cc:62
    #1 0x52464ce in IPC::SyncMessage::GenerateReply(IPC::Message const*) ipc/ipc_sync_message.cc:99
    #2 0x9f6ec47 in Tuple4 ipc/ipc_message_utils.h:877
    #3 0x9f6ec47 in bool FrameHostMsg_RunJavaScriptMessage::DispatchDelayReply\u003Ccontent::RenderFrameHostImpl, void (content::RenderFrameHostImpl::*)(std::basic_string\u003Cunsigned short, base::string16_char_traits, std::allocator\u003Cunsigned short> > const&, std::basic_string\u003Cunsigned short, base::string16_char_traits, std::allocator\u003Cunsigned short> > const&, GURL const&, content::JavaScriptMessageType, IPC::Message*)>(IPC::Message const*, content::RenderFrameHostImpl*, void (content::RenderFrameHostImpl::*)(std::basic_string\u003Cunsigned short, base::string16_char_traits, std::allocator\u003Cunsigned short> > const&, std::basic_string\u003Cunsigned short, base::string16_char_traits, std::allocator\u003Cunsigned short> > const&, GURL const&, content::JavaScriptMessageType, IPC::Message*)) content/common/frame_messages.h:545
    #4 0x9f6b9d3 in content::RenderFrameHostImpl::OnMessageReceived(IPC::Message const&) content/browser/frame_host/render_frame_host_impl.cc:287
    #5 0xa1185d9 in content::RenderProcessHostImpl::OnMessageReceived(IPC::Message const&) content/browser/renderer_host/render_process_host_impl.cc:1346
    #6 0x5239eec in IPC::ChannelProxy::Context::OnDispatchMessage(IPC::Message const&) ipc/ipc_channel_proxy.cc:269
    #7 0x3256fbf in Run base/callback.h:401
    #8 0x3256fbf in base::MessageLoop::RunTask(base::PendingTask const&) base/message_loop/message_loop.cc:450
    #9 0x3258e35 in DeferOrRunPendingTask base/message_loop/message_loop.cc:462
    #10 0x3258e35 in base::MessageLoop::DoWork() base/message_loop/message_loop.cc:576
    #11 0x32fab87 in base::MessagePumpGlib::Run(base::MessagePump::Delegate*) base/message_loop/message_pump_glib.cc:270
    #12 0x3290314 in base::RunLoop::Run() base/run_loop.cc:49
    #13 0xc55c305 in content::RunThisRunLoop(base::RunLoop*) content/public/test/test_utils.cc:103
    #14 0xc55e252 in operator-> content/public/test/test_utils.cc:165
    #15 0xc55e252 in content::WindowedNotificationObserver::Wait() content/public/test/test_utils.cc:225
    #16 0x31af7c1 in ui_test_utils::WaitForAppModalDialog() chrome/test/base/ui_test_utils.cc:342
    #17 0x19c1ed8 in BrowserTest_SadTabCancelsSubframeDialogs_Test::RunTestOnMainThread() chrome/browser/ui/browser_browsertest.cc:585
    #18 0x31996b8 in InProcessBrowserTest::RunTestOnMainThreadLoop() chrome/test/base/in_process_browser_test.cc:419


Original issue's description:
> Ensure that modal dialogs from subframes can be cleaned up correctly.
> 
> BUG=366510
> TEST=See bug comment 7 for repro steps.
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=266638

TBR=avi@chromium.org,sky@chromium.org,creis@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=366510
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=266669

[robliao, 2014-04-28 21:47:18]

Created Revert of Ensure that modal dialogs from subframes can be cleaned up
correctly.

[commit-bot: I haz the power, 2014-04-28 21:49:12]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/robliao@chromium.org/257863004/1

[commit-bot: I haz the power, 2014-04-28 21:50:52]

Change committed as 266669