Fix lifetime management of WebSocketStreamhandleImpl::Context and WebSocketStreamHandleBridge.
Fix lifetime management of WebSocketStreamhandleImpl::Context and WebSocketStreamHandleBridge.

Fix memory leak of WebSocketStreamHandleBridge hold in Context.
Detach Context before WebSocketStreamHandle is deleted.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/315011

git-svn-id: http://src.chromium.org/svn/trunk/src@29765 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 71b2afad8d29f9b9404d3b7fcfa5d5585ef6e69e
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser