Revert of Bind Application in renderer

Revert of Bind Application in renderer (patchset #15 id:280001 of https://codereview.chromium.org/1452823003/ )

Reason for revert:
This change is making hundreds of webkit_tests crash on linux_chromium_rel_ng with:

[1:1:1118/141621:108326049405:FATAL:lock.cc(32)] Check failed: owning_thread_ref_.is_null().
#0 0x00000067e2de base::debug::StackTrace::StackTrace()
#1 0x00000057a71f logging::LogMessage::~LogMessage()
#2 0x0000005eb69b base::Lock::CheckUnheldAndMark()
#3 0x000000518e1c base::Lock::Acquire()
#4 0x000000518b43 base::AutoLock::AutoLock()
#5 0x0000005b4014 base::SequenceCheckerImpl::CalledOnValidSequencedThread()
#6 0x000006f074ae IDMap<>::Lookup()
#7 0x000006f0598c content::RendererBlinkPlatformImpl::SetPlatformEventObserverForTesting()
#8 0x000008459264 content::SetMockGamepadProvider()

Original issue's description:
> Bind Application in renderer.
>
> This involved changing how we get the client handle to the renderer. In the first iteration I was passing this on the command line but that turns out not to work with the sandbox. So instead I an approach used by the Mojo-in-Chrome MojoApplication class and pass the primordial handle via Chrome IPC.
>
> I had to twiddle a bunch of BUILD.gn files in content to get this to work without crashing due to inconsistencies in how MOJO_SHELL_CLIENT was defined.
>
> R=jam@chromium.org,tsepez@chromium.org
> http://crbug.com/551253
>
> Committed: https://crrev.com/3edb97198bc5fbc22c5cf13286e8af80449ddfb9
> Cr-Commit-Position: refs/heads/master@{#360293}
>
> Committed: https://crrev.com/2c716f9d5ebff610641f4506c17ec81d4b89b7bb
> Cr-Commit-Position: refs/heads/master@{#360396}

TBR=jam@chromium.org,tsepez@chromium.org,ben@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/1b3bd8ec1752e2c0442746c0f1f60e693601b4f2
Cr-Commit-Position: refs/heads/master@{#360446}

[alancutter (OOO until 2018), 2015-11-18 23:49:21]

Created Revert of Bind Application in renderer

[commit-bot: I haz the power, 2015-11-18 23:51:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1457173002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1457173002/1

[commit-bot: I haz the power, 2015-11-18 23:54:29]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-18 23:55:27]

Patchset 1 (id:??) landed as
https://crrev.com/1b3bd8ec1752e2c0442746c0f1f60e693601b4f2
Cr-Commit-Position: refs/heads/master@{#360446}