This CL is generated by a clang tool being added by http://crrev.com/2283003002.
scoped_refptr<>::get() on method bindings are unneeded, are a source of implicit
raw pointer to scoped_refptr<> conversion, and make following refactoring less
mechanical.
This CL removes most of get() call throughout the source tree.

BUG=589048
CQ_INCLUDE_TRYBOTS=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

Review-Url: https://codereview.chromium.org/2283373002
Cr-Commit-Position: refs/heads/master@{#415878}