Oilpan: Replace all of RefPtrs to Attr with Oilpan transition types.

BUG=357163

Review URL: https://codereview.chromium.org/282213002

git-svn-id: svn://svn.chromium.org/blink/trunk@174487 bbb929c8-8fbe-4397-9dbb-9b2b20218538
[DevTools] Timeline is not recording for shared workers.

Analysis: WorkerInspectorController.connectFrontend do not call
InspectorInstrumentation::frontendCreated. As a consequence,
instrumentation methods with Inline=FastReturn never get invoked.

BUG=316686

Review URL: https://codereview.chromium.org/19794002

git-svn-id: svn://svn.chromium.org/blink/trunk@174488 bbb929c8-8fbe-4397-9dbb-9b2b20218538