Clean up related storage areas when a connection is destroyed
https://bugs.webkit.org/show_bug.cgi?id=114459

Reviewed by Beth Dakin.

* UIProcess/Storage/StorageManager.cpp:
(WebKit::StorageManager::processWillCloseConnection):
Dispatch invalidateConnectionInternal on the work queue.

(WebKit::StorageManager::createStorageMap):
(WebKit::StorageManager::destroyStorageMap):
Rename m_storageAreas to m_storageAreasByConnection.

(WebKit::StorageManager::invalidateConnectionInternal):
Go over all known storage areas and remove this connection as a listener.

(WebKit::StorageManager::findStorageArea):
Rename m_storageAreas to m_storageAreasByConnection.

* UIProcess/Storage/StorageManager.h:
Rename m_storageAreas to m_storageAreasByConnection.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148229 268f45cc-cd09-0410-ab3c-d52691b4dbfc