ART: Rename Handle hierarchy

Bring the names in line with normal OO principles: ConstHandle
becomes Handle, and Handle becomes MutableHandle.

Change-Id: I0f018eb7ba28bc422e3a23dd73a6cbe6fc2d2044
diff --git a/runtime/debugger.cc b/runtime/debugger.cc
index c8bb537..cc1e0b9 100644
--- a/runtime/debugger.cc
+++ b/runtime/debugger.cc
@@ -3611,7 +3611,7 @@
   }
 
   // Translate the method through the vtable, unless the debugger wants to suppress it.
-  Handle<mirror::ArtMethod> m(hs.NewHandle(pReq->method));
+  MutableHandle<mirror::ArtMethod> m(hs.NewHandle(pReq->method));
   if ((pReq->options & JDWP::INVOKE_NONVIRTUAL) == 0 && pReq->receiver != nullptr) {
     mirror::ArtMethod* actual_method = pReq->klass->FindVirtualMethodForVirtualOrInterface(m.Get());
     if (actual_method != m.Get()) {