GM::height() now returns the height, not the width.

Fortunately, the only current caller has a width and height that
match, so this should not change any existing GMs.

Review URL: https://codereview.chromium.org/14234022

git-svn-id: http://skia.googlecode.com/svn/trunk@8669 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed