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/oat_file_assistant.cc b/runtime/oat_file_assistant.cc
index 6c869ca..f7c74cc 100644
--- a/runtime/oat_file_assistant.cc
+++ b/runtime/oat_file_assistant.cc
@@ -354,7 +354,7 @@
     std::vector<std::unique_ptr<const DexFile>>* out_dex_files) {
   // Load the main dex file.
   std::string error_msg;
-  const OatFile::OatDexFile* oat_dex_file = oat_file.GetOatDexFile(
+  const OatDexFile* oat_dex_file = oat_file.GetOatDexFile(
       dex_location.c_str(), nullptr, &error_msg);
   if (oat_dex_file == nullptr) {
     LOG(WARNING) << error_msg;
@@ -453,7 +453,7 @@
   for (uint32_t i = 0; i < number_of_dex_files; i++) {
     std::string dex = DexFileLoader::GetMultiDexLocation(i, dex_location_.c_str());
     uint32_t expected_checksum = (*required_dex_checksums)[i];
-    const OatFile::OatDexFile* oat_dex_file = file.GetOatDexFile(dex.c_str(), nullptr);
+    const OatDexFile* oat_dex_file = file.GetOatDexFile(dex.c_str(), nullptr);
     if (oat_dex_file == nullptr) {
       *error_msg = StringPrintf("failed to find %s in %s", dex.c_str(), file.GetLocation().c_str());
       return false;
@@ -921,7 +921,7 @@
         required_dex_checksums_found_ = true;
         for (size_t i = 0; i < odex_file->GetOatHeader().GetDexFileCount(); i++) {
           std::string dex = DexFileLoader::GetMultiDexLocation(i, dex_location_.c_str());
-          const OatFile::OatDexFile* odex_dex_file = odex_file->GetOatDexFile(dex.c_str(), nullptr);
+          const OatDexFile* odex_dex_file = odex_file->GetOatDexFile(dex.c_str(), nullptr);
           if (odex_dex_file == nullptr) {
             required_dex_checksums_found_ = false;
             break;