Class clean-up.

Move Class code out of native and into Java.
Remove ClassLinker::FindDexFile.

Change-Id: Idd9c4563d2c32e76690675242ff491276ace9848
diff --git a/src/exception_test.cc b/src/exception_test.cc
index c35572d..58e6533 100644
--- a/src/exception_test.cc
+++ b/src/exception_test.cc
@@ -38,7 +38,7 @@
     ASSERT_TRUE(my_klass_ != NULL);
     class_linker_->EnsureInitialized(my_klass_, false, true);
 
-    dex_ = &Runtime::Current()->GetClassLinker()->FindDexFile(my_klass_->GetDexCache());
+    dex_ = my_klass_->GetDexCache()->GetDexFile();
 
     uint32_t code_size = 12;
     fake_code_.push_back((code_size >> 24) & 0xFF);