Fix some style issues in Rect I noticed.

gfx/rect.h

 // Copyright (c) 2010 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.
 
 // Defines a simple integer 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 21 matching lines @@
   Rect();
   Rect(int width, int height);
   Rect(int x, int y, int width, int height);
 #if defined(OS_WIN)
   explicit Rect(const RECT& r);
 #elif defined(OS_MACOSX)
   explicit Rect(const CGRect& r);
 #elif defined(USE_X11)
   explicit Rect(const GdkRectangle& r);
 #endif
-  Rect(const gfx::Size& size);
+  explicit Rect(const gfx::Size& size);
   Rect(const gfx::Point& origin, const gfx::Size& size);
 
   ~Rect() {}
 
 #if defined(OS_WIN)
   Rect& operator=(const RECT& r);
 #elif defined(OS_MACOSX)
   Rect& operator=(const CGRect& r);
 #elif defined(USE_X11)
   Rect& operator=(const GdkRectangle& r);
 #endif
 
   int x() const { return origin_.x(); }
   void set_x(int x) { origin_.set_x(x); }
 
   int y() const { return origin_.y(); }
   void set_y(int y) { origin_.set_y(y); }
 
   int width() const { return size_.width(); }
-  void set_width(int width);
+  void set_width(int width) { size_.set_width(width); }
 
   int height() const { return size_.height(); }
-  void set_height(int height);
+  void set_height(int height) { size_.set_height(height); }
 
   const gfx::Point& origin() const { return origin_; }
   void set_origin(const gfx::Point& origin) { origin_ = origin; }
 
   const gfx::Size& size() const { return size_; }
   void set_size(const gfx::Size& size) { size_ = size; }
 
   int right() const { return x() + width(); }
   int bottom() const { return y() + height(); }
 
@@ skipping 86 matching lines @@
  private:
   gfx::Point origin_;
   gfx::Size size_;
 };
 
 }  // namespace gfx
 
 std::ostream& operator<<(std::ostream& out, const gfx::Rect& r);
 
 #endif  // GFX_RECT_H_