Do not indefinitely cache resources from blob URLs.

Reviewed by Alexey Proskuryakov.

Alexey pointed out after I landed r150169 that blob URLs backed by
files should return an error if the file changed after the URL was
created. By indefinitely caching them in memory, we don't give the
loader a chance to check for modification. Remove "blob" from the list
of schemes that should be indefinitely cached.

* platform/SchemeRegistry.cpp:
(WebCore::SchemeRegistry::shouldCacheResponsesFromURLSchemeIndefinitely):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@150210 268f45cc-cd09-0410-ab3c-d52691b4dbfc