Use 'final' and 'override' specifiers directly in ART.

Remove all uses of macros 'FINAL' and 'OVERRIDE' and replace them with
'final' and 'override' specifiers. Remove all definitions of these
macros as well, which were located in these files:
- libartbase/base/macros.h
- test/913-heaps/heaps.cc
- test/ti-agent/ti_macros.h

ART is now using C++14; the 'final' and 'override' specifiers have
been introduced in C++11.

Test: mmma art
Change-Id: I256c7758155a71a2940ef2574925a44076feeebf
diff --git a/runtime/java_frame_root_info.h b/runtime/java_frame_root_info.h
index 25ac6e2..452a76b 100644
--- a/runtime/java_frame_root_info.h
+++ b/runtime/java_frame_root_info.h
@@ -27,12 +27,12 @@
 
 class StackVisitor;
 
-class JavaFrameRootInfo FINAL : public RootInfo {
+class JavaFrameRootInfo final : public RootInfo {
  public:
   JavaFrameRootInfo(uint32_t thread_id, const StackVisitor* stack_visitor, size_t vreg)
      : RootInfo(kRootJavaFrame, thread_id), stack_visitor_(stack_visitor), vreg_(vreg) {
   }
-  void Describe(std::ostream& os) const OVERRIDE
+  void Describe(std::ostream& os) const override
       REQUIRES_SHARED(Locks::mutator_lock_);
 
   size_t GetVReg() const {