Revert 201806 "Create MetroViewerProcessHost as a common base fo..."

Revert 201806 "Create MetroViewerProcessHost as a common base fo..."

Broke ash_unittests on Win8 Aura:
http://build.chromium.org/p/chromium.win/builders/Win8%20Aura/builds/6316

[ RUN      ] AcceleratorControllerTest.Register
[912:1324:0523/094526:1371217:INFO:test_metro_viewer_process_host.cc(42)] ash::test::TestMetroViewerProcessHost::OnSetTargetSurface, target_surface = 131580
[912:1324:0523/094526:1371233:FATAL:ash_test_base.cc(149)] Check failed: !metro_viewer_host_->closed_unexpectedly(). 
Backtrace:
  base::debug::StackTrace::StackTrace [0x100839F1+33]
  logging::LogMessage::~LogMessage [0x100F6FCE+94]
  ash::test::AshTestBase::TearDown [0x006DC397+471]
  testing::internal::HandleExceptionsInMethodIfSupported<testing::Test,void> [0x007405FF+319]
  testing::Test::Run [0x0072A525+229]
  testing::TestInfo::Run [0x0072AF4D+221]
  testing::TestCase::Run [0x0072B71F+239]
  testing::internal::UnitTestImpl::RunAllTests [0x0073234D+701]
  testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl,bool> [0x00741227+327]
  testing::UnitTest::Run [0x00730BB0+192]
  base::TestSuite::Run [0x00756AE0+240]
  main [0x0058AFA4+100]
  __tmainCRTStartup [0x0075BA6F+447] (f:\dd\vctools\crt_bld\self_x86\crt\src\crtexe.c:555)
  mainCRTStartup [0x0075B89F+15] (f:\dd\vctools\crt_bld\self_x86\crt\src\crtexe.c:371)
  BaseThreadInitThunk [0x76D78543+14]
  RtlInitializeExceptionChain [0x7775AC69+133]
  RtlInitializeExceptionChain [0x7775AC3C+88]
  (No symbol) [0x00000000]

[912:1324:0523/094526:1371233:FATAL:ash_test_base.cc(149)] Check failed: !metro_viewer_host_->closed_unexpectedly(). 
Backtrace:
  base::debug::StackTrace::StackTrace [0x100839F1+33]
  logging::LogMessage::~LogMessage [0x100F6FCE+94]
  ash::test::AshTestBase::TearDown [0x006DC397+471]
  testing::internal::HandleExceptionsInMethodIfSupported<testing::Test,void> [0x007405FF+319]
  testing::Test::Run [0x0072A525+229]
  testing::TestInfo::Run [0x0072AF4D+221]
  testing::TestCase::Run [0x0072B71F+239]
  testing::internal::UnitTestImpl::RunAllTests [0x0073234D+701]
  testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl,bool> [0x00741227+327]
  testing::UnitTest::Run [0x00730BB0+192]
  base::TestSuite::Run [0x00756AE0+240]
  main [0x0058AFA4+100]
  __tmainCRTStartup [0x0075BA6F+447] (f:\dd\vctools\crt_bld\self_x86\crt\src\crtexe.c:555)
  mainCRTStartup [0x0075B89F+15] (f:\dd\vctools\crt_bld\self_x86\crt\src\crtexe.c:371)
  BaseThreadInitThunk [0x76D78543+14]
  RtlInitializeExceptionChain [0x7775AC69+133]
  RtlInitializeExceptionChain [0x7775AC3C+88]
  (No symbol) [0x00000000]

> Create MetroViewerProcessHost as a common base for TestMetroViewerProcessHost and ChromeMetroViewerProcessHost
> 
> Bringing LaunchViewerAndWaitForConnection() to the common base so that ChromeMetroViewerProcessHost can also benefit from it (required for ash browser tests).
> 
> BUG=179830
> 
> Review URL: https://chromiumcodereview.appspot.com/14629025

TBR=gab@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=201966

[Dan Beam, 2013-05-24 03:27:04]

Committed patchset #1 manually as r201966.