android: Clean up RenderWidgetHostViewAndroid GetScaledContentBitmap and unused clipping

The |out_size| parameter is no longer necessary.  The clipping
code is also no longer used by the android side so it can removed.


Was: "android: Fix out_size in RenderWidgetHostViewAndroid::GetScaledContentBitmap"

android= https://chrome-internal-review.googlesource.com/155559

BUG=326363

Review URL: https://codereview.chromium.org/159753007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253172 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253172