Remove the last StorageSyncManager function
https://bugs.webkit.org/show_bug.cgi?id=115371

Reviewed by Sam Weinig.

Move the import scheduling to the StorageAreaSync constructor. Remove code to set m_importComplete to true
since that could only happen if the StorageSyncManager's thread is null which doesn't make any sense.

* storage/StorageAreaSync.cpp:
(WebCore::StorageAreaSync::StorageAreaSync):
(WebCore::StorageAreaSync::create):
* storage/StorageSyncManager.cpp:
* storage/StorageSyncManager.h:
(StorageSyncManager):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149311 268f45cc-cd09-0410-ab3c-d52691b4dbfc