Oilpan: Prepare to move IDBDatabaseCallbacks to Oilpan heap.

IDBDatabaseCallbacks::m_database should be a WeakMember because
WebIDBDatabaseCallbacksImpl has a strong reference to 
IDBDatabaseCallbacks and WebIDBDatabaseCallbacksImpl can outlive
the associated IDBDatabase. If DBDatabaseCallbacks::m_database was
a strong reference, a lifetime assumption of Indexed DB would be
broken and some tests would fail.


BUG=366528

Review URL: https://codereview.chromium.org/268023002

git-svn-id: svn://svn.chromium.org/blink/trunk@173470 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove Crash from TestExpectations entry for worker-reload-repeated.html

It's no longer crashing.

BUG=349537
R=yhirano@chromium.org

Review URL: https://codereview.chromium.org/273573002

git-svn-id: svn://svn.chromium.org/blink/trunk@173471 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Fix mime-type of layout tests

git-svn-id: svn://svn.chromium.org/blink/trunk@173472 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Oilpan: Use HeapListHashSet for IDBTransaction::m_requestList.

BUG=366528

Review URL: https://codereview.chromium.org/269353002

git-svn-id: svn://svn.chromium.org/blink/trunk@173473 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Auto-rebaseline for r173452

http://src.chromium.org/viewvc/blink?view=revision&revision=173452

BUG=369609
TBR=enne@chromium.org

Review URL: https://codereview.chromium.org/274543002

git-svn-id: svn://svn.chromium.org/blink/trunk@173474 bbb929c8-8fbe-4397-9dbb-9b2b20218538
HTML Imports: Fix hidden flakiness on tests

Some tests depends on a FOUC behavior and should be fixed to
wait a renderable frame.

BUG=370490
R=esprehn@chromium.org, dglazkov@chromium.org

Review URL: https://codereview.chromium.org/269313002

git-svn-id: svn://svn.chromium.org/blink/trunk@173476 bbb929c8-8fbe-4397-9dbb-9b2b20218538
SelectorChecker should check if previousElement is null for ::shadow.

We cannot apply any styles to ::shadow, i.e. shadow roots.
So if ::shadow is the rightmost selector of a given complex selector,
the complex selector should not match any elements.

BUG=367266
TEST=fast/dom/shadow/shadow-pseudo-element.html

Review URL: https://codereview.chromium.org/266493002

git-svn-id: svn://svn.chromium.org/blink/trunk@173477 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Oilpan: Add trace events to platform/heap/

Review URL: https://codereview.chromium.org/263833008

git-svn-id: svn://svn.chromium.org/blink/trunk@173478 bbb929c8-8fbe-4397-9dbb-9b2b20218538