Do not convert from RectF to Rect by flooring.

ui/gfx/rect_base.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // A template for a simple rectangle class.  The containment semantics
 // are array-like; that is, the coordinate (x, y) is considered to be
 // contained by the rectangle, but the coordinate (x + width, y) is not.
 // The class will happily let you create malformed rectangles (that is,
 // rectangles with negative width and/or height), but there will be assertions
 // in the operations (such as Contains()) to complain in this case.
@@ skipping 47 matching lines @@
 
   // Shrink the rectangle by the specified amount on each side.
   void Inset(Type left, Type top, Type right, Type bottom);
 
   // Move the rectangle by a horizontal and vertical distance.
   void Offset(Type horizontal, Type vertical);
   void Offset(const PointClass& point) {
     Offset(point.x(), point.y());
   }
 
-  /// Scales the rectangle by |scale|.
-  Class Scale(float scale) const WARN_UNUSED_RESULT {
-    return Scale(scale, scale);
-  }
-
-  Class Scale(float x_scale, float y_scale) const WARN_UNUSED_RESULT {
-    return Class(origin_.Scale(x_scale, y_scale),
-                 size_.Scale(x_scale, y_scale));
-  }
-
   InsetsClass InsetsFrom(const Class& inner) const {
     return InsetsClass(inner.y() - y(),
                        inner.x() - x(),
                        bottom() - inner.bottom(),
                        right() - inner.right());
   }
 
   // Returns true if the area of the rectangle is zero.
   bool IsEmpty() const { return size_.IsEmpty(); }
 
@@ skipping 75 matching lines @@
   ~RectBase();
 
  private:
   PointClass origin_;
   SizeClass size_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RECT_BASE_H_