SkPDF: PDFStream has-a not is-a PDFDict

src/pdf/SkPDFFormXObject.cpp

Index: src/pdf/SkPDFFormXObject.cpp
diff --git a/src/pdf/SkPDFFormXObject.cpp b/src/pdf/SkPDFFormXObject.cpp
index 1ab391c3460a78f27bba186af11a2f3529e07382..5c0a576f99e4b7692963f6827991d448bc2bc57e 100644
--- a/src/pdf/SkPDFFormXObject.cpp
+++ b/src/pdf/SkPDFFormXObject.cpp
@@ -13,10 +13,10 @@ sk_sp<SkPDFObject> SkPDFMakeFormXObject(std::unique_ptr<SkStreamAsset> content,
                                         sk_sp<SkPDFDict> resourceDict,
                                         const char* colorSpace) {
     auto form = sk_make_sp<SkPDFStream>(std::move(content));
-    form->insertName("Type", "XObject");
-    form->insertName("Subtype", "Form");
-    form->insertObject("Resources", std::move(resourceDict));
-    form->insertObject("BBox", std::move(mediaBox));
+    form->dict()->insertName("Type", "XObject");
+    form->dict()->insertName("Subtype", "Form");
+    form->dict()->insertObject("Resources", std::move(resourceDict));
+    form->dict()->insertObject("BBox", std::move(mediaBox));
 
     // Right now FormXObject is only used for saveLayer, which implies
     // isolated blending.  Do this conditionally if that changes.
@@ -28,6 +28,6 @@ sk_sp<SkPDFObject> SkPDFMakeFormXObject(std::unique_ptr<SkStreamAsset> content,
         group->insertName("CS", colorSpace);
     }
     group->insertBool("I", true);  // Isolated.
-    form->insertObject("Group", std::move(group));
+    form->dict()->insertObject("Group", std::move(group));
     return form;
 }