[Coverity] pass-by-ref instead of pass-by-val

CID=103838
R=estade@chromium.org

BUG=
TEST=


Review URL: http://codereview.chromium.org/10166012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@133492 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/ui/gtk/find_bar_gtk.cc

@@ -418,7 +418,8 @@ void FindBarGtk::AudibleAlert() {
   //   gtk_widget_error_bell(widget());
 }
 
-gfx::Rect FindBarGtk::GetDialogPosition(gfx::Rect avoid_overlapping_rect) {
+gfx::Rect FindBarGtk::GetDialogPosition(
+    const gfx::Rect& avoid_overlapping_rect) {
   bool ltr = !base::i18n::IsRTL();
   // 15 is the size of the scrollbar, copied from ScrollbarThemeChromium.
   // The height is not used.

chrome/browser/ui/gtk/find_bar_gtk.h

@@ -104,7 +104,7 @@ class FindBarGtk : public FindBar,
   // the top of the page area, (it will be converted to coordinates relative to
   // the top of the browser window, when comparing against the dialog
   // coordinates). The returned value is relative to the browser window.
-  gfx::Rect GetDialogPosition(gfx::Rect avoid_overlapping_rect);
+  gfx::Rect GetDialogPosition(const gfx::Rect& avoid_overlapping_rect);
 
   // Adjust the text alignment according to the text direction of the widget
   // and |text_entry_|'s content, to make sure the real text alignment is