[Android] Fix the signature of several methods.

This patch series contains fixes to a lot of different classes whose
methods were not overriding their parents' anymore due to changes in the
upstream names.

Since Android is normally built with GCC 4.6 and in C++98 mode, we were
not notified when this happened (the situation is progressively
improving: M37 uses GCC 4.8 by default, while M38 turns on C++11).

This is also crosswalk-8 material; I will likely be on vacations so
someone else needs to cherry-pick these patches there after they're
merged into master.

At least commit 8224037 ("[Android] Rename
XWalkRenderViewHostExt::RenderViewGone") reacts to a change made more
than a year ago. It would be good if @wang16 or someone else from the
Android team takes a look at the impact of the problem it fixes and
cherry-picked it into crosswalk-7 if it is relevant enough.