Remove bogus StorageAreaMap assertions
https://bugs.webkit.org/show_bug.cgi?id=115838

Reviewed by Sam Weinig.

It is possible for didGetValues, and didClear to be called even if m_hasPendingClear is false so remove the assertions.

* WebProcess/Storage/StorageAreaMap.cpp:
(WebKit::StorageAreaMap::didGetValues):
(WebKit::StorageAreaMap::didClear):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149783 268f45cc-cd09-0410-ab3c-d52691b4dbfc