Delete canvas_win.cc since it is no longer used.

ui/gfx/canvas.h

Index: ui/gfx/canvas.h
===================================================================
--- ui/gfx/canvas.h	(revision 145540)
+++ ui/gfx/canvas.h	(working copy)
@@ -24,7 +24,6 @@
 
 namespace gfx {
 
-class Brush;
 class Rect;
 class Font;
 class Point;
@@ -412,17 +411,6 @@
       float user_defined_scale_factor_x,
       float user_defined_scale_factor_y)  const;
 
-#if defined(OS_WIN)
-  // Draws text with the specified color, font and location. The text is
-  // aligned to the left, vertically centered, clipped to the region. If the
-  // text is too big, it is truncated and '...' is added to the end.
-  void DrawStringInt(const string16& text,
-                     HFONT font,
-                     SkColor color,
-                     const gfx::Rect& text_bounds,
-                     int flags);
-#endif
-
   scoped_ptr<skia::PlatformCanvas> owned_canvas_;
   SkCanvas* canvas_;