Changes to print preview layout.

Changes to print preview layout.

Modifies the print preview layout to better match the specs
for the new dialog style. This CL affects the layout for the
print preview even when the new dialog style is not used.

A close button will be added after we've switched to the new
dialog style, as the old style already has a close button in
the top right corner.

Spec: https://docs.google.com/a/google.com/folder/d/0B6x6iYCtKinEUTFOWUJFTWJFSTA/edit?docId=0B6x6iYCtKinERFBFenZxdlVCQUk
Before, old dialog style: http://i.imgur.com/8uDarV3.png
Before, new dialog style: http://i.imgur.com/QXdap6W.png
After, old dialog style: http://i.imgur.com/M0BaBy8.png
After, new dialog style: http://i.imgur.com/OFmL5tc.png

BUG=133363

Review URL: https://chromiumcodereview.appspot.com/14752026

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@200459 0039d316-1c4b-4281-b951-d872f2087c98