Cleanup usage of GetResourcePath() after commit bcbc1788b478b1e54079318ad073e8490aa66fae.

There was a clean up opportunity left over after
https://skia.googlesource.com/skia/+/bcbc1788b478b1e54079318ad073e8490aa66fae, that could make use of the default parameter of GetResourcePath() function to make some call sites cleaner.

We decided to make it in a separate CL to make reviewer's and author's life easier, so we could catch errors and/or mistakes easily.

BUG=None
TEST=make all && out/Debug/dm && out/Debug/SampleApp
R=mtklein@google.com

Author: tfarina@chromium.org

Review URL: https://codereview.chromium.org/351133003
13 files changed