ART: Finish old move of OatDexFile

The class has been made standalone so it can be forward-declared,
but not all nested references had been updated.

Test: mmma art
Change-Id: Idc5f0af24af17dcae286dee290f729ba61693a11
diff --git a/runtime/class_linker.cc b/runtime/class_linker.cc
index 7b92ba4..c219d3d 100644
--- a/runtime/class_linker.cc
+++ b/runtime/class_linker.cc
@@ -1338,7 +1338,7 @@
     REQUIRES_SHARED(Locks::mutator_lock_) {
   DCHECK(error_msg != nullptr);
   std::unique_ptr<const DexFile> dex_file;
-  const OatFile::OatDexFile* oat_dex_file = oat_file->GetOatDexFile(location, nullptr, error_msg);
+  const OatDexFile* oat_dex_file = oat_file->GetOatDexFile(location, nullptr, error_msg);
   if (oat_dex_file == nullptr) {
     return std::unique_ptr<const DexFile>();
   }
@@ -4181,7 +4181,7 @@
     }
   }
 
-  const OatFile::OatDexFile* oat_dex_file = dex_file.GetOatDexFile();
+  const OatDexFile* oat_dex_file = dex_file.GetOatDexFile();
   // In case we run without an image there won't be a backing oat file.
   if (oat_dex_file == nullptr || oat_dex_file->GetOatFile() == nullptr) {
     return false;