Fix test failures of IDBTransactionTest.EnsureLifetime with ENABLE(OILPAN)

Fix test failures of IDBTransactionTest.EnsureLifetime with ENABLE(OILPAN)

This is a regression caused by r174937.
After r174937, ExecutionContexts created for IDBRequestTest and IDBTransactionTest
outlive the tests (because the lifetime of the ExecutionContexts is bound to a ScriptState
associated with the tests). This is wrong, and we should clear the ExecutionContexts
when shutting down the tests.

BUG=379616
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=175259

[haraken, 2014-06-02 04:55:32]

PTAL

[tkent, 2014-06-02 06:08:14]

lgtm.

I think it's ok to use constructor/destructor instead of SetUp/TearDown in this
case.

https://code.google.com/p/googletest/wiki/FAQ#Should_I_use_the_constructor/de...

[tkent, 2014-06-02 06:09:14]

Please remove MAYBE_EnsureLifetime in IDBTransactionTest.cpp.

[zerny-chromium, 2014-06-02 06:22:44]

lgtm

[sof, 2014-06-02 06:40:53]

As other IDB unit tests are also failing w/ Oilpan atm, it'd be good to get this
one in sooner :)

[haraken, 2014-06-02 07:07:28]

On 2014/06/02 06:09:14, tkent wrote:
> Please remove MAYBE_EnsureLifetime in IDBTransactionTest.cpp.

Removed. Landing the CL via a commit-queue.

[haraken, 2014-06-02 07:07:37]

The CQ bit was checked by haraken@chromium.org

[commit-bot: I haz the power, 2014-06-02 07:07:48]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/haraken@chromium.org/307933011/40001

[commit-bot: I haz the power, 2014-06-02 08:58:14]

Change committed as 175259