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 RenderWidget::OnImeSetComposition(WebCompositionCommand command,
                                       int cursor_position,
                                       int target_start, int target_end,
                                       const string16& ime_string) {
  if (!webwidget_)
    return;
  ime_control_busy_ = true;
  if (!webwidget_->handleCompositionEvent(command, cursor_position,
      target_start, target_end, ime_string) &&
      command == WebKit::WebCompositionCommandSet) {
    Send(new ViewHostMsg_ImeUpdateStatus(routing_id(), IME_CANCEL_COMPOSITION,
                                         WebRect()));
  }
  ime_control_busy_ = false;
}

void RenderWidget::OnImeSetComposition(WebCompositionCommand command,
                                       int cursor_position,
                                       int target_start, int target_end,
                                       const string16& ime_string) {
  if (!webwidget_)
    return;
  ime_control_busy_ = true;
  if (!webwidget_->handleCompositionEvent(command, cursor_position,
      target_start, target_end, ime_string) &&
      command == WebKit::WebCompositionCommandSet) {
    Send(new ViewHostMsg_ImeUpdateStatus(routing_id(), IME_CANCEL_COMPOSITION,
                                         WebRect()));
  }
  ime_control_busy_ = false;
}
