Fix many return-std-move-in-c++11 warnings

Bug: 113696918

Cherry-pick of f7621cb5bb4ee181d557aeb6fa557819daba5fd2 in upstream.

Conflicts:
	experimental/skottie/Skottie.cpp
	src/pdf/SkPDFBitmap.cpp

Change-Id: I0e5e47a01d5f749c5aa8cf26f9f6123a0b414333
Merged-In: I0a36cec8829aee0081072b25e838096f99602cb3
8 files changed