Revert of SkPDF: Subset Type3 (fallback) font

src/pdf/SkPDFDocument.cpp

Index: src/pdf/SkPDFDocument.cpp
diff --git a/src/pdf/SkPDFDocument.cpp b/src/pdf/SkPDFDocument.cpp
index 4a577fcff34ac1632541c72fca7d1734f1a2dcd1..7723cafb12358b10cebd28adb49b15abafd8b1bf 100644
--- a/src/pdf/SkPDFDocument.cpp
+++ b/src/pdf/SkPDFDocument.cpp
@@ -483,8 +483,8 @@
 
     // Build font subsetting info before calling addObjectRecursively().
     for (const auto& entry : fGlyphUsage) {
-        sk_sp<SkPDFObject> subsetFont =
-            entry.fFont->getFontSubset(&entry.fGlyphSet);
+        sk_sp<SkPDFFont> subsetFont(
+                entry.fFont->getFontSubset(&entry.fGlyphSet));
         if (subsetFont) {
             fObjectSerializer.fSubstituteMap.setSubstitute(
                     entry.fFont, subsetFont.get());