This is a better name for the header that matches its main class.
MozReview-Commit-ID: KSt9LVT3yRR
--HG--
rename : gfx/layers/apz/src/Keyboard.cpp => gfx/layers/apz/src/KeyboardMap.cpp
rename : gfx/layers/apz/src/Keyboard.h => gfx/layers/apz/src/KeyboardMap.h
extra : rebase_source : ec4c9ec5afa8479dc4cd3e987fc3293f047beb9e
extra : histedit_source : caa3a11043fc1ccdff3d7853eda69a0a3dfff99e