Add non-member non-mutating methods for common gfx::Rect operations.

chrome/browser/ui/views/toolbar_view.cc

Index: chrome/browser/ui/views/toolbar_view.cc
diff --git a/chrome/browser/ui/views/toolbar_view.cc b/chrome/browser/ui/views/toolbar_view.cc
index 4e8049c7df859b668ece8c6b33806017bd42d7fb..c7c534400908286e38f9971405ce693f042bc0b1 100644
--- a/chrome/browser/ui/views/toolbar_view.cc
+++ b/chrome/browser/ui/views/toolbar_view.cc
@@ -444,8 +444,8 @@ void ToolbarView::LayoutForSearch() {
   // Note that parent of |location_bar_container_| i.e. BrowserView can't clip
   // its children, else it loses the 3D shadows.
   gfx::Rect parent_rect = location_bar_container_->parent()->GetLocalBounds();
-  gfx::Rect intersect_rect = parent_rect;
-  intersect_rect.Intersect(location_container_bounds);
+  gfx::Rect intersect_rect =
+      gfx::Intersection(parent_rect, location_container_bounds);
   // If the two bounds don't intersect, set bounds of |location_bar_container_|
   // to 0.
   location_bar_container_->SetBoundsRect(intersect_rect);