Remove dependency on VectorPlatformDeviceEmf.

skia/ext/platform_device_win.h

Index: skia/ext/platform_device_win.h
===================================================================
--- skia/ext/platform_device_win.h	(revision 95234)
+++ skia/ext/platform_device_win.h	(working copy)
@@ -52,6 +52,11 @@
   // Returns if GDI is allowed to render text to this device.
   virtual bool IsNativeFontRenderingAllowed() { return true; }
 
+  // True if AlphaBlend() was called during a
+  // BeginPlatformPaint()/EndPlatformPaint() pair.
+  // Used by the printing subclasses.  See |VectorPlatformDeviceEmf|.
+  virtual bool AlphaBlendUsed() const { return false; }
+
   // Loads a SkPath into the GDI context. The path can there after be used for
   // clipping or as a stroke. Returns false if the path failed to be loaded.
   static bool LoadPathToDC(HDC context, const SkPath& path);