Revert "Make the JIT the default in ART."

Few tests failing: oat_file_assistant_test and jit run tests.

This reverts commit 0a9b6826bc6e71d799eb3fe8829981597b890dee.

Change-Id: Ibbf73c191d244ebb9517b6ae97971dd9a9d37d7c
diff --git a/runtime/oat_file_manager.cc b/runtime/oat_file_manager.cc
index f26d431..ea6d3ff 100644
--- a/runtime/oat_file_manager.cc
+++ b/runtime/oat_file_manager.cc
@@ -298,12 +298,10 @@
 
   const OatFile* source_oat_file = nullptr;
 
-  if (Runtime::Current()->IsDex2OatEnabled()) {
-    // Update the oat file on disk if we can. This may fail, but that's okay.
-    // Best effort is all that matters here.
-    if (!oat_file_assistant.MakeUpToDate(/*out*/&error_msg)) {
-      LOG(WARNING) << error_msg;
-    }
+  // Update the oat file on disk if we can. This may fail, but that's okay.
+  // Best effort is all that matters here.
+  if (!oat_file_assistant.MakeUpToDate(/*out*/&error_msg)) {
+    LOG(WARNING) << error_msg;
   }
 
   // Get the oat file on disk.