Revert of bluetooth: Move testing IPC from BluetoothDispatcher to BlinkTestRunner

Revert of bluetooth: Move testing IPC from BluetoothDispatcher to BlinkTestRunner (patchset #2 id:250001 of https://codereview.chromium.org/1125133005/)

Reason for revert:
Broke a bunch of Layout Tests. Here's an example: http://test-results.appspot.com/dashboards/flakiness_dashboard.html#showExpectations=true&tests=virtual%2Fstable%2Fanimations-unprefixed%2Fanimation-events-prefixed-04.html

STDERR: ==28151==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000050 (pc 0x000006a00bd0 bp 0x7fff171be890 sp 0x7fff171be880 T0)
STDERR:     #0 0x6a00bcf in content::BluetoothDispatcherHost::SetBluetoothAdapterForTesting(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) content/browser/bluetooth/bluetooth_dispatcher_host.cc:63:43
STDERR:     #1 0x4e5d9d in OnSetBluetoothAdapter content/shell/browser/layout_test/layout_test_message_filter.cc:171:3
STDERR:     #2 0x4e5d9d in DispatchToMethodImpl<content::LayoutTestMessageFilter, void (content::LayoutTestMessageFilter::*)(const std::__1::basic_string<char> &), std::__1::basic_string<char> , 0> base/tuple.h:252:0

Original issue's description:
> bluetooth: Move testing IPC from BluetoothDispatcher to BlinkTestRunner
>
> This patch removes the testing IPC from BluetoothDispatcher and
> BluetoothDispatcherHost.
>
> This patch also changes the way the mock BluetoothAdapter was set in
> BluetoothDispatcherHost. Instead of receiving an IPC to set the adapter,
> BluetoothDispatcherHost exposes a function to directly set the adapter.
> This function is used by LayoutTestSupport to set the adapter.
>
> Mock adapter flow before:
> BlinkTestRunner -> LayoutTestSupport -> BluetoothDispatcher --IPC-->
> BluetoothDispatcherHost (Mock constructed here)
>
> After:
> BlinkTestRunner --IPC--> LayoutTestMessages(Mock constructed here) ->
> LayoutTestSupport -> BluetoothDispatcherHost
>
> This is the first of two patches to remove testing from BluetoothDispatcher
> and BluetoothDispatcherHost:
>
>  [1] This patch.
>  [2] http://crrev.com/1132943002
>
> BUG=436284
>
> Committed: https://crrev.com/3f7142d0acf5e930743cbe5d754084c464ac3c85
> Cr-Commit-Position: refs/heads/master@{#330647}

TBR=jam@chromium.org,scheib@chromium.org,tsepez@chromium.org,ortuno@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=436284
Committed: https://crrev.com/5e096ae82760009e5435785ca7fb2f96b0f0f473
Cr-Commit-Position: refs/heads/master@{#330653}

[leviw_travelin_and_unemployed, 2015-05-20 00:18:09]

Created Revert of bluetooth: Move testing IPC from BluetoothDispatcher to
BlinkTestRunner

[commit-bot: I haz the power, 2015-05-20 00:21:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1142303002/1

[commit-bot: I haz the power, 2015-05-20 00:26:32]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-20 00:27:36]

Patchset 1 (id:??) landed as
https://crrev.com/5e096ae82760009e5435785ca7fb2f96b0f0f473
Cr-Commit-Position: refs/heads/master@{#330653}