Clean up calls like "gfx::Rect(0, 0, size().width(), size().height()".

The caller can use the much shorter "gfx::Rect(size())", since gfx::Rect
has a constructor that just takes a Size.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/2204001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@48283 0039d316-1c4b-4281-b951-d872f2087c98
  void WillSendRequest(const GURL& url) {
    DCHECK(channel_ != NULL);
    channel_->Send(new PluginMsg_WillSendRequest(instance_id_, resource_id_,
                                                 url));
  }

  void WillSendRequest(const GURL& url) {
    DCHECK(channel_ != NULL);
    channel_->Send(new PluginMsg_WillSendRequest(instance_id_, resource_id_,
                                                 url));
  }
