This CL replaces instances of make_scoped_refptr() with MakeRefCounted()
for constructing scoped_refptr<>s where possible. MakeRefCounted() only
works if the class has a public constructor, so not all instances are
replaced.

Bug: 765333
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Ic53d512940f7cc53a959e967a63da0ca94a95eae
Reviewed-on: https://chromium-review.googlesource.com/676646


Commit-Queue: kylechar <kylechar@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504151}