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/compiler/linker/output_stream_test.cc b/compiler/linker/output_stream_test.cc
index f93ea7a..bcb129c 100644
--- a/compiler/linker/output_stream_test.cc
+++ b/compiler/linker/output_stream_test.cc
@@ -106,20 +106,20 @@
     CheckingOutputStream()
         : OutputStream("dummy"),
           flush_called(false) { }
-    ~CheckingOutputStream() OVERRIDE {}
+    ~CheckingOutputStream() override {}
 
     bool WriteFully(const void* buffer ATTRIBUTE_UNUSED,
-                    size_t byte_count ATTRIBUTE_UNUSED) OVERRIDE {
+                    size_t byte_count ATTRIBUTE_UNUSED) override {
       LOG(FATAL) << "UNREACHABLE";
       UNREACHABLE();
     }
 
-    off_t Seek(off_t offset ATTRIBUTE_UNUSED, Whence whence ATTRIBUTE_UNUSED) OVERRIDE {
+    off_t Seek(off_t offset ATTRIBUTE_UNUSED, Whence whence ATTRIBUTE_UNUSED) override {
       LOG(FATAL) << "UNREACHABLE";
       UNREACHABLE();
     }
 
-    bool Flush() OVERRIDE {
+    bool Flush() override {
       flush_called = true;
       return true;
     }