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/dexlayout/dex_container.h b/dexlayout/dex_container.h
index 2b9a5f9..2d742b0 100644
--- a/dexlayout/dex_container.h
+++ b/dexlayout/dex_container.h
@@ -57,19 +57,19 @@
    public:
     virtual ~VectorSection() {}
 
-    uint8_t* Begin() OVERRIDE {
+    uint8_t* Begin() override {
       return &data_[0];
     }
 
-    size_t Size() const OVERRIDE {
+    size_t Size() const override {
       return data_.size();
     }
 
-    void Resize(size_t size) OVERRIDE {
+    void Resize(size_t size) override {
       data_.resize(size, 0u);
     }
 
-    void Clear() OVERRIDE {
+    void Clear() override {
       data_.clear();
     }