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/jni/java_vm_ext_test.cc b/runtime/jni/java_vm_ext_test.cc
index 74e4a30..fe1c168 100644
--- a/runtime/jni/java_vm_ext_test.cc
+++ b/runtime/jni/java_vm_ext_test.cc
@@ -34,7 +34,7 @@
   }
 
 
-  virtual void TearDown() OVERRIDE {
+  virtual void TearDown() override {
     CommonRuntimeTest::TearDown();
   }
 
@@ -137,7 +137,7 @@
 
 class JavaVmExtStackTraceTest : public JavaVmExtTest {
  protected:
-  void SetUpRuntimeOptions(RuntimeOptions* options) OVERRIDE {
+  void SetUpRuntimeOptions(RuntimeOptions* options) override {
     options->emplace_back("-XX:GlobalRefAllocStackTraceLimit=50000", nullptr);
   }
 };