Revert 159122 "Fix Skia FontCache platform data construction to ..."

This breaks Android(dbg) contentshell_instrumentation_tests
org.chromium.content.browser.input.ImeTest#testEnterTextAndRefocus

aurimas suggests that those tests inject javascript, ask where the input
is, and try to click on it, and due to the changing size here, it misses
and can't find the input.  This may be just a test failure, but it also
might be something more sinister, so I am choosing to revert to unblock
the Blink roll.  (Sorry!)

> Fix Skia FontCache platform data construction to use right font size
> 
> The skia version of FontCache::createFontPlatformData incorrectly used
> fontDescription.computedSize instead of computedPixelSize even if sub-
> pixel font scaling wasn't enabled. This could cause an entry with the
> wrong size to be added to the FontCache.
> 
> BUG=304986
> R=leviw@chromium.org
> 
> Review URL: https://codereview.chromium.org/26272006

TBR=eae@chromium.org

Review URL: https://codereview.chromium.org/26644002

git-svn-id: svn://svn.chromium.org/blink/trunk@159185 bbb929c8-8fbe-4397-9dbb-9b2b20218538