Fix metrics test to no longer include the cpp.

The inclusion of the cpp caused linker errors when building skia
components as shared libaries for inclusion in an Android app.
Review URL: https://codereview.appspot.com/6338063

git-svn-id: http://skia.googlecode.com/svn/trunk@4323 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed