Rename ObjPtr::Decode to ObjPtr::Ptr

Done to prevent ambiguity with ScopedObjectAccess::Decode.

Bug: 31113334

Test: test-art-host
Change-Id: I07a2497cc9cf66386311798933547471987fc316
diff --git a/runtime/common_runtime_test.cc b/runtime/common_runtime_test.cc
index ea07195..84752f0 100644
--- a/runtime/common_runtime_test.cc
+++ b/runtime/common_runtime_test.cc
@@ -514,9 +514,9 @@
       soa.Decode<mirror::ClassLoader>(jclass_loader));
 
   DCHECK_EQ(class_loader->GetClass(),
-            soa.Decode<mirror::Class>(WellKnownClasses::dalvik_system_PathClassLoader).Decode());
+            soa.Decode<mirror::Class>(WellKnownClasses::dalvik_system_PathClassLoader).Ptr());
   DCHECK_EQ(class_loader->GetParent()->GetClass(),
-            soa.Decode<mirror::Class>(WellKnownClasses::java_lang_BootClassLoader).Decode());
+            soa.Decode<mirror::Class>(WellKnownClasses::java_lang_BootClassLoader).Ptr());
 
   // The class loader is a PathClassLoader which inherits from BaseDexClassLoader.
   // We need to get the DexPathList and loop through it.