Corrects the class name "ExtensionManager"

Corrects ExtensionManager to extensions.ExtensionManager which was
earlier written without the package name.

There were no errors encountered as first condition of the condition set
always evaluated True.

Change-Id: I1fd4016105a99a7baaad6d2613b0e709a09aeeb2
Closes-Bug: #1323400
Merge "Corrects the class name "ExtensionManager""