FW: Remove ViewRoot.java - Corrects errors with Dolphin Jetpack

The ViewRoot.java file was removed from Cyanogenmod a long time ago and renamed ViewRootImpl.java, for some reason we retained this file which contained a single function declaration. This was also defined within the ViewRootImpl.java file.

Modification to ViewRootImpl.java to remove the reference to ViewRoot.java.

Compiled and tested with no issues and Dolphin Jetpack now loads correctly.

Change-Id: Icc6cf9f1ac834cd0d40e9e0358235f936d1614e0