Browser Plugin: Fix whitespace

BUG=none
TBR=fsamuel@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/29023003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229422 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229422