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/monitor_test.cc b/runtime/monitor_test.cc
index bff8d76..c88748f 100644
--- a/runtime/monitor_test.cc
+++ b/runtime/monitor_test.cc
@@ -34,7 +34,7 @@
 
 class MonitorTest : public CommonRuntimeTest {
  protected:
-  void SetUpRuntimeOptions(RuntimeOptions *options) OVERRIDE {
+  void SetUpRuntimeOptions(RuntimeOptions *options) override {
     // Use a smaller heap
     SetUpRuntimeOptionsForFillHeap(options);