Remove a few residual references to the old OVERRIDE and FINAL macros.

Source/wtf/Compiler.h

Index: Source/wtf/Compiler.h
diff --git a/Source/wtf/Compiler.h b/Source/wtf/Compiler.h
index 0e236fdb5dbea6b255121ae77b7926ffb0a2afdc..77bd54425286df6e803da60e45c70c27c7631acc 100644
--- a/Source/wtf/Compiler.h
+++ b/Source/wtf/Compiler.h
@@ -55,7 +55,6 @@
 #define WTF_COMPILER_SUPPORTS_BLOCKS __has_feature(blocks)
 #define WTF_COMPILER_SUPPORTS_C_STATIC_ASSERT __has_extension(c_static_assert)
 #define WTF_COMPILER_SUPPORTS_CXX_STATIC_ASSERT __has_extension(cxx_static_assert)
-#define WTF_COMPILER_SUPPORTS_CXX_OVERRIDE_CONTROL __has_extension(cxx_override_control)
 #define WTF_COMPILER_SUPPORTS_HAS_TRIVIAL_DESTRUCTOR __has_extension(has_trivial_destructor)
 #define WTF_COMPILER_SUPPORTS_CXX_STRONG_ENUMS __has_extension(cxx_strong_enums)
 
@@ -73,8 +72,6 @@
 #if COMPILER(CLANG)
 /* Keep strong enums turned off when building with clang-cl: We cannot yet build all of Blink without fallback to cl.exe, and strong enums are exposed at ABI boundaries. */
 #undef WTF_COMPILER_SUPPORTS_CXX_STRONG_ENUMS
-#else
-#define WTF_COMPILER_SUPPORTS_CXX_OVERRIDE_CONTROL 1
 #endif
 
 #endif
@@ -111,9 +108,6 @@
 /* Strong enums should work from gcc 4.4, but doesn't seem to support some operators */
 #define WTF_COMPILER_SUPPORTS_CXX_STRONG_ENUMS 1
 #endif
-#if GCC_VERSION_AT_LEAST(4, 7, 0)
-#define WTF_COMPILER_SUPPORTS_CXX_OVERRIDE_CONTROL 1
-#endif
 #endif /* defined(__GXX_EXPERIMENTAL_CXX0X__) || (defined(__cplusplus) && __cplusplus >= 201103L) */
 #endif /* COMPILER(GCC) */