PDF: Canon now owns a reference to all interned objects

src/doc/SkDocument_PDF.cpp

Index: src/doc/SkDocument_PDF.cpp
diff --git a/src/doc/SkDocument_PDF.cpp b/src/doc/SkDocument_PDF.cpp
index 468111c86bcc3175690c6382ccb4d47a12945cbb..e486737d7e5e85ef6c0781d27bafaea76feec713 100644
--- a/src/doc/SkDocument_PDF.cpp
+++ b/src/doc/SkDocument_PDF.cpp
@@ -56,13 +56,13 @@ protected:
 
         bool success = fDoc->emitPDF(stream);
         fDoc.free();
-        SkDEBUGCODE(fCanon.assertEmpty());
+        fCanon.reset();
         return success;
     }
 
     void onAbort() SK_OVERRIDE {
         fDoc.free();
-        SkDEBUGCODE(fCanon.assertEmpty());
+        fCanon.reset();
     }
 
 private: