Allow remoting_unittests to build on Android.

This removes base/resources_unittest.cc from Android build, since the
functions in resources.h are not implemented for Android.

BUG=326702
TEST=Target remoting_unittests builds without error.

Review URL: https://codereview.chromium.org/103863006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239834 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239834