PDF: Canon now owns a reference to all interned objects

src/pdf/SkPDFFont.cpp

Index: src/pdf/SkPDFFont.cpp
diff --git a/src/pdf/SkPDFFont.cpp b/src/pdf/SkPDFFont.cpp
index f386b7152393e8773629ae865c95eb07f1ba6257..dc7168a0f785a63ce3081a2bf3b64ff39b69d565 100644
--- a/src/pdf/SkPDFFont.cpp
+++ b/src/pdf/SkPDFFont.cpp
@@ -747,7 +747,7 @@ SkPDFGlyphSet* SkPDFGlyphSetMap::getGlyphSetForFont(SkPDFFont* font) {
  * from each page and combine it and ask for a resource with that subset.
  */
 
-SkPDFFont::~SkPDFFont() { fCanon->removeFont(this); }
+SkPDFFont::~SkPDFFont() {}
 
 SkTypeface* SkPDFFont::typeface() {
     return fTypeface.get();
@@ -854,7 +854,7 @@ SkPDFFont* SkPDFFont::GetFontResource(SkPDFCanon* canon,
 
     SkPDFFont* font = SkPDFFont::Create(canon, fontMetrics.get(), typeface,
                                         glyphID, relatedFontDescriptor);
-    canon->addFont(font, fontID, font->fFirstGlyphID);
+    canon->addFont(SkRef(font), fontID, font->fFirstGlyphID);
     return font;
 }