Revert 207875 "Native Android accessibility."

Revert 207875 "Native Android accessibility."
Broke Android Tests:
http://build.chromium.org/p/chromium.linux/buildstatus?builder=Android%20Tests&number=5462
Some output:
W  102s Main  Failed obtaining tests from 014E378305008009 with exception: End Of File (EOF) in read_nonblocking(). Exception style platform.
<pexpect.spawn object at 0x28d5510>
version: 2.3 ($Revision: 399 $)
command: /b/build_internal/scripts/slave/android/adb
args: ['/b/build_internal/scripts/slave/android/adb', '-s', '014E378305008009', 'shell', 'cat', '/data/data/org.chromium.native_test/files/test.fifo']
searcher: searcher_re:
    0: re.compile("<<ScopedMainEntryLogger")
buffer (last 100 chars): 
before (last 100 chars): t/browser/accessibility/BrowserAccessibilityManager

> Native Android accessibility.
> 
> This is the final changelist that completes the initial implementation.
> When accessibility is on and script injection is turned off or
> unavailable, constructs a BrowserAccessibilityManager for the
> ContentViewCore that provides a native accessibility implementation.
> 
> BUG=242953
> R=benm@chromium.org, bulach@chromium.org, dtrainor@chromium.org
> 
> Review URL: https://codereview.chromium.org/15741009

TBR=dmazzoni@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=207891

[dmichael (off chromium), 2013-06-21 19:00:44]

Committed patchset #1 manually as r207891.