SkPDF: AutoTUnref<T> changes in use

    ::detach()      -> ::release()
    ::operator T*() -> ::get()

This makes all use of AutoTUnref work the same as sk_sp.
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1772493002

Review URL: https://codereview.chromium.org/1772493002
diff --git a/src/pdf/SkPDFResourceDict.cpp b/src/pdf/SkPDFResourceDict.cpp
index 2f9abca..b72e666 100644
--- a/src/pdf/SkPDFResourceDict.cpp
+++ b/src/pdf/SkPDFResourceDict.cpp
@@ -66,7 +66,7 @@
         resources->insertObjRef(SkPDFResourceDict::getResourceName(type, i),
                                 SkRef(resourceList[i]));
     }
-    dst->insertObject(get_resource_type_name(type), resources.detach());
+    dst->insertObject(get_resource_type_name(type), resources.release());
 }
 
 SkPDFDict* SkPDFResourceDict::Create(
@@ -83,19 +83,19 @@
     for (size_t i = 0; i < SK_ARRAY_COUNT(kProcs); i++) {
         procSets->appendName(kProcs[i]);
     }
-    dict->insertObject("ProcSets", procSets.detach());
+    dict->insertObject("ProcSets", procSets.release());
 
     if (gStateResources) {
-        add_subdict(*gStateResources, kExtGState_ResourceType, dict);
+        add_subdict(*gStateResources, kExtGState_ResourceType, dict.get());
     }
     if (patternResources) {
-        add_subdict(*patternResources, kPattern_ResourceType, dict);
+        add_subdict(*patternResources, kPattern_ResourceType, dict.get());
     }
     if (xObjectResources) {
-        add_subdict(*xObjectResources, kXObject_ResourceType, dict);
+        add_subdict(*xObjectResources, kXObject_ResourceType, dict.get());
     }
     if (fontResources) {
-        add_subdict(*fontResources, kFont_ResourceType, dict);
+        add_subdict(*fontResources, kFont_ResourceType, dict.get());
     }
-    return dict.detach();
+    return dict.release();
 }