Don't instantiate non-Fragments in Fragment.instantiate

Backport...

Fix for PreferenceActivities being invoked with non-Fragment class
names via extras in the intent. Make sure that the constructor
doesn't get called if the class name is not for a Fragment type.
Bug: 9901133
Change-Id: I227756fb4246deac796cee09077e482237bb5b0d
1 file changed