Revert 226874 "Observe keyboard notifications in docked layout"

Broke ash_unittests on Win8 Aura:

[ RUN      ] AcceleratorControllerTest.ControllerContext
[1576:2656:1003/160630:1215294:WARNING:ipc_channel_win.cc(263)] Unable to create pipe "\\.\pipe\chrome.viewer" in server mode. Error :231
[1576:2656:1003/160731:1276431:FATAL:ash_test_base.cc(134)] Check failed: metro_viewer_host_->LaunchViewerAndWaitForConnection( win8::test::kDefaultTestAppUserModelId). 
Backtrace:
  base::debug::StackTrace::StackTrace [0x100886A1+33]
  logging::LogMessage::~LogMessage [0x1011580E+94]
  ash::test::AshTestBase::SetUp [0x008061DD+1405]
  testing::internal::HandleExceptionsInMethodIfSupported<testing::Test,void> [0x007DE47F+319]
  testing::Test::Run [0x007C8E9B+107]
  testing::TestInfo::Run [0x007C98AD+221]
  testing::TestCase::Run [0x007CA05F+239]
  testing::internal::UnitTestImpl::RunAllTests [0x007D09AD+701]
  testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl,bool> [0x007DF0A7+327]
  testing::UnitTest::Run [0x007CF210+192]
  base::TestSuite::Run [0x007A4070+240]
  main [0x00612167+103]
  __tmainCRTStartup [0x0094A1EF+447] (f:\dd\vctools\crt_bld\self_x86\crt\src\crtexe.c:555)
  mainCRTStartup [0x0094A01F+15] (f:\dd\vctools\crt_bld\self_x86\crt\src\crtexe.c:371)
  BaseThreadInitThunk [0x778C8543+14]
  RtlInitializeExceptionChain [0x77C0AC69+133]
  RtlInitializeExceptionChain [0x77C0AC3C+88]
  (No symbol) [0x00000000]

[1576:2656:1003/160731:1276431:FATAL:ash_test_base.cc(134)] Check failed: metro_viewer_host_->LaunchViewerAndWaitForConnection( win8::test::kDefaultTestAppUserModelId). 
Backtrace:
  base::debug::StackTrace::StackTrace [0x100886A1+33]
  logging::LogMessage::~LogMessage [0x1011580E+94]
  ash::test::AshTestBase::SetUp [0x008061DD+1405]
  testing::internal::HandleExceptionsInMethodIfSupported<testing::Test,void> [0x007DE47F+319]
  testing::Test::Run [0x007C8E9B+107]
  testing::TestInfo::Run [0x007C98AD+221]
  testing::TestCase::Run [0x007CA05F+239]
  testing::internal::UnitTestImpl::RunAllTests [0x007D09AD+701]
  testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl,bool> [0x007DF0A7+327]
  testing::UnitTest::Run [0x007CF210+192]
  base::TestSuite::Run [0x007A4070+240]
  main [0x00612167+103]
  __tmainCRTStartup [0x0094A1EF+447] (f:\dd\vctools\crt_bld\self_x86\crt\src\crtexe.c:555)
  mainCRTStartup [0x0094A01F+15] (f:\dd\vctools\crt_bld\self_x86\crt\src\crtexe.c:371)
  BaseThreadInitThunk [0x778C8543+14]
  RtlInitializeExceptionChain [0x77C0AC69+133]
  RtlInitializeExceptionChain [0x77C0AC3C+88]
  (No symbol) [0x00000000]

> Observe keyboard notifications in docked layout
> 
> BUG=303456
> 
> Review URL: https://codereview.chromium.org/25740005

TBR=varkha@chromium.org

Review URL: https://codereview.chromium.org/25683010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226943 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226943