Remove unused SampleTests.cpp source file.

We never compile this file.

BUG=None
TEST=tests
R=reed@google.com, robertphillips@google.com

Review URL: https://codereview.chromium.org/143823016

git-svn-id: http://skia.googlecode.com/svn/trunk@13157 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed