Class clean-up.

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

Change-Id: Idd9c4563d2c32e76690675242ff491276ace9848
diff --git a/src/debugger.cc b/src/debugger.cc
index c8e7381..6f0ec58 100644
--- a/src/debugger.cc
+++ b/src/debugger.cc
@@ -2167,7 +2167,7 @@
           gSingleStepControl.method = m;
           gSingleStepControl.line_number = -1;
           if (dex_cache != NULL) {
-            const DexFile& dex_file = Runtime::Current()->GetClassLinker()->FindDexFile(dex_cache);
+            const DexFile& dex_file = *dex_cache->GetDexFile();
             gSingleStepControl.line_number = dex_file.GetLineNumFromPC(m, GetDexPc());
           }
         }