Revert of Introduce KeepAliveWhilePending to ScriptPromiseResolverWithContext.

Revert of Introduce KeepAliveWhilePending to ScriptPromiseResolverWithContext. (https://codereview.chromium.org/311733004/)

Reason for revert:
This CL breaks the build.

Original issue's description:
> Introduce KeepAliveWhilePending to ScriptPromiseResolverWithContext.
> 
> Some modules, for example WebMIDI and WebCrypto, needs "Async Initializer".
> The initializer should stay alive until the initialization succeeds (i.e. the
> associated Promise is resolved), the initialization fails
> (i.e. rejected), or the associated ExecutionContext is stopped.
> This CL introduces the the constructor mode ScriptPromiseResolverWithContext.
> If KeepAliveWhilePending is specified, the created resolver stays alive while
> one of the above conditions meets.
> Each initializer can stay alive by inheriting ScriptPromiseResolverWithContext.
> 
> This CL rewrites WebMIDI and WebCrypto async operations with it.
> 
> BUG=361041
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=176381
TBR=yhirano, haraken, eroman, toyoshim@chromium.org
NOTREECHECKS=true
NOTRY=true

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=176383

[yhirano, 2014-06-18 03:19:39]

Created Revert of Introduce KeepAliveWhilePending to
ScriptPromiseResolverWithContext.

[commit-bot: I haz the power, 2014-06-18 03:20:00]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/yhirano@chromium.org/339443004/1

[commit-bot: I haz the power, 2014-06-18 03:20:01]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-06-18 03:20:02]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[yhirano, 2014-06-18 03:22:31]

The CQ bit was checked by yhirano@chromium.org

[commit-bot: I haz the power, 2014-06-18 03:23:01]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/yhirano@chromium.org/339443004/1

[commit-bot: I haz the power, 2014-06-18 03:23:31]

Change committed as 176383

[haraken, 2014-06-18 03:25:05]

LGTM