Revert of Add DumpAccessibilityEvents test framework.

Revert of Add DumpAccessibilityEvents test framework. (patchset #7 id:120001 of https://codereview.chromium.org/790943002/)

Reason for revert:
Failing on Win7 x64 bots:

http://build.chromium.org/p/chromium.win/builders/Win%207%20Tests%20x64%20%281%29/builds/19602

DumpAccessibilityEventsTest.AccessibilityEventsCheckedStateChanged (run #1):
[ RUN      ] DumpAccessibilityEventsTest.AccessibilityEventsCheckedStateChanged
[3528:3920:1217/131127:60955425:FATAL:accessibility_event_recorder_win.cc(147)] Check failed: SUCCEEDED(hr). Failure accessing accessible object from hwnd 0000000016F90210 obj_id=-4 child_id=-1004

DumpAccessibilityEventsTest.AccessibilityEventsCheckedStateChanged (run #2):
[ RUN      ] DumpAccessibilityEventsTest.AccessibilityEventsCheckedStateChanged
[3048:3524:1217/131600:61228380:FATAL:accessibility_event_recorder_win.cc(147)] Check failed: SUCCEEDED(hr). Failure accessing accessible object from hwnd 000000001E4B01E8 obj_id=-4 child_id=-1004

DumpAccessibilityEventsTest.AccessibilityEventsCheckedStateChanged (run #3):
[ RUN      ] DumpAccessibilityEventsTest.AccessibilityEventsCheckedStateChanged
[2984:1592:1217/131601:61229628:FATAL:accessibility_event_recorder_win.cc(147)] Check failed: SUCCEEDED(hr). Failure accessing accessible object from hwnd 000000001663021A obj_id=-4 child_id=-1004

DumpAccessibilityEventsTest.AccessibilityEventsCheckedStateChanged (run #4):
[ RUN      ] DumpAccessibilityEventsTest.AccessibilityEventsCheckedStateChanged
[3628:408:1217/131602:61230049:FATAL:accessibility_event_recorder_win.cc(147)] Check failed: SUCCEEDED(hr). Failure accessing accessible object from hwnd 0000000009890254 obj_id=-4 child_id=-1004

Original issue's description:
> Add DumpAccessibilityEvents test framework.
>
> Currently works on Windows only, but designed to be cross-platform with
> just a bit of effort.
>
> BUG=440579
>
> Committed: https://crrev.com/8531606ec6e5294559a8dd1bd04cbbcb63514dee
> Cr-Commit-Position: refs/heads/master@{#308844}

TBR=dtseng@chromium.org,dmazzoni@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=440579
Committed: https://crrev.com/7d4cb46a26a4bd93153969e4f0d65e390d2a69c5
Cr-Commit-Position: refs/heads/master@{#308864}

[Cait (Slow), 2014-12-17 21:50:28]

Created Revert of Add DumpAccessibilityEvents test framework.

[commit-bot: I haz the power, 2014-12-17 21:51:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/811213002/1

[commit-bot: I haz the power, 2014-12-17 21:52:48]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-17 21:53:38]

Patchset 1 (id:??) landed as
https://crrev.com/7d4cb46a26a4bd93153969e4f0d65e390d2a69c5
Cr-Commit-Position: refs/heads/master@{#308864}