Revert 235533 because the test added in the CL fails on win8-aura

The crash trace is as follows:
[2188:1892:1117/092153:837538:FATAL:display_manager.cc(571)] Check failed: 1u == updated_display_info_list.size() (1 vs. 2)Multiple display test does not work on Win8 bots. Please skip (don't disable) the test using SupportsMultipleDisplays()
Backtrace:
  base::debug::StackTrace::StackTrace [0x6C2DBBF1+33]
  logging::LogMessage::~LogMessage [0x6C10D2FE+94]
  ash::internal::DisplayManager::UpdateDisplays [0x5BC233C5+293]
  ash::internal::DisplayManager::OnNativeDisplaysChanged [0x5BC22B43+2723]
  ash::test::DisplayManagerTestApi::UpdateDisplay [0x00CDB1D7+775]
  ash::test::AshTestBase::UpdateDisplay [0x00CD7309+121]
  ash::test::ShelfViewMultiMonitorTest::SetUp [0x0098B136+102]
  testing::internal::HandleExceptionsInMethodIfSupported<testing::Test,void> [0x00CAF59F+319]
  testing::Test::Run [0x00C99FBB+107]
  testing::TestInfo::Run [0x00C9A9CD+221]
  testing::TestCase::Run [0x00C9B17F+239]
  testing::internal::UnitTestImpl::RunAllTests [0x00CA1ACD+701]
  testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl,bool> [0x00CB01C7+327]
  testing::UnitTest::Run [0x00CA0330+192]
  base::TestSuite::Run [0x00C8EEE0+240]
  main [0x00BA9227+103]
  __tmainCRTStartup [0x00E1978F+447] (f:\dd\vctools\crt_bld\self_x86\crt\src\crtexe.c:555)
  mainCRTStartup [0x00E195BF+15] (f:\dd\vctools\crt_bld\self_x86\crt\src\crtexe.c:371)
  BaseThreadInitThunk [0x76638543+14]
  RtlInitializeExceptionChain [0x7788AC69+133]
  RtlInitializeExceptionChain [0x7788AC3C+88]

> [ash] Enable dragging an item from the overflow bubble to the shelf bounds
> 
> This is the first CL to implement drag and drop from overflow bubble to shelf.
> 
> Currently ripped off item from overflow bubble cannot be dragged into shelf.
> But, Item should be dragged from overflow bubble to shelf to implement drag & drop.
> In this CL, re-insert bounds for shelf/overflow bubble is re-defined like below.
>   - shelf -bounds that include visible items.
>   - overflow bubble - overflow bubble bounds.
> 
> * The method of ripping off is not changed (dragging an item to above only in bottom alignment)
> If ripping off is possible by dragging to down side, it could cause flickering because overflow bubble and shelf is located too closely.
> 
> R=harrym@chromium.org, jamescook@chromium.org
> BUG=137141
> TEST=browser_tests, ash_unittests
> 
> Review URL: https://codereview.chromium.org/61703002

TBR=simon.hong81@gmail.com

Review URL: https://codereview.chromium.org/74733002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235537 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 235537