Explicitly return false in WasAllocatedUsingRobustnessExtension

This is the default behavior of gfx::GLContext, but explicitly do it
for documentation purpose and cover the case of the behavior of
gfx::GLContext would change in the future.

This also updates the submodule to include the change that uses this
value.

Change-Id: I214376d92b4f9f11bd491c2b1263cf8159e5779f
Reviewed-by: Andras Becsi <andras.becsi@digia.com>