commit 1b0b710282e282c2ce595845af90f54bd460c95d
author haraken <haraken@chromium.org> Thu Jul 14 14:06:34 2016
committer Commit bot <commit-bot@chromium.org> Thu Jul 14 14:08:31 2016
tree 7a8baa7c748859fc44662ae50f39dd75d168f2bd
parent 6f0c1ec23bc1eabe221fccdb4b28b1d96273a705

ServiceWorkerContainer should override contextDestroyed and clear m_provider

After landing https://codereview.chromium.org/2138003002/,
http/tests/serviceworkers/ tests started hitting ASSERT(!m_provider)
in ServiceWorkerContainer's destructor.
I don't really know why the CL triggered the assert, but we can fix the issue
by overriding contextDestroyed in ServiceWorkerContainer and clear m_provider there.
This CL makes the change.

BUG=

Review-Url: https://codereview.chromium.org/2144213002
Cr-Commit-Position: refs/heads/master@{#405486}