A host of micro-optimizations and a refactor of TimeForBoundsToIntersect

ui/gfx/rect_f.cc

Index: ui/gfx/rect_f.cc
diff --git a/ui/gfx/rect_f.cc b/ui/gfx/rect_f.cc
index d7b1089c96de6c556d3fc08b85ebc2e1fe86c4cd..0f055e1928dbc9fb7b3b4a073cd9a5499c45ef09 100644
--- a/ui/gfx/rect_f.cc
+++ b/ui/gfx/rect_f.cc
@@ -31,18 +31,6 @@ std::string RectF::ToString() const {
                             size().ToString().c_str());
 }
 
-RectF operator+(const RectF& lhs, const Vector2dF& rhs) {
-  RectF result(lhs);
-  result += rhs;
-  return result;
-}
-
-RectF operator-(const RectF& lhs, const Vector2dF& rhs) {
-  RectF result(lhs);
-  result -= rhs;
-  return result;
-}
-
 RectF IntersectRects(const RectF& a, const RectF& b) {
   RectF result = a;
   result.Intersect(b);
@@ -61,12 +49,6 @@ RectF SubtractRects(const RectF& a, const RectF& b) {
   return result;
 }
 
-RectF ScaleRect(const RectF& r, float x_scale, float y_scale) {
-  RectF result = r;
-  result.Scale(x_scale, y_scale);
-  return result;
-}
-
 RectF BoundingRect(const PointF& p1, const PointF& p2) {
   float rx = std::min(p1.x(), p2.x());
   float ry = std::min(p1.y(), p2.y());