win: Fix remaining plugin warnings in ash, device, printing, sandbox.

printing/emf_win.h

Index: printing/emf_win.h
diff --git a/printing/emf_win.h b/printing/emf_win.h
index e3019884c388449274f895b0154d6e9249bd4ee9..dcdfd8c99a46fac5e8a55d5ceacbca9884779649 100644
--- a/printing/emf_win.h
+++ b/printing/emf_win.h
@@ -74,12 +74,8 @@ class PRINTING_EXPORT Emf : public Metafile {
   // Should be passed to Playback to keep the exact same size.
   gfx::Rect GetPageBounds(unsigned int page_number) const override;
 
-  unsigned int GetPageCount() const override { return 1; }
-
-  HDC context() const override {
-    return hdc_;
-  }
-
+  unsigned int GetPageCount() const override;
+  HDC context() const override;
   bool Playback(HDC hdc, const RECT* rect) const override;
   bool SafePlayback(HDC hdc) const override;
 
@@ -163,6 +159,8 @@ class PRINTING_EXPORT Emf::Enumerator {
   // Warning: |emf| must be kept valid for the time this object is alive.
   Enumerator(const Emf& emf, HDC hdc, const RECT* rect);
 
+  ~Enumerator();
+
   // Retrieves the first Record.
   const_iterator begin() const;