Consistently use only one of virtual/OVERRIDE/FINAL.

src/x64/code-stubs-x64.h

Index: src/x64/code-stubs-x64.h
diff --git a/src/x64/code-stubs-x64.h b/src/x64/code-stubs-x64.h
index d17fa1b5ff93531adecf4f36292cf67217c0eecf..0efcf7fd1cac39391dda33dd6b68b89d44c64c40 100644
--- a/src/x64/code-stubs-x64.h
+++ b/src/x64/code-stubs-x64.h
@@ -71,7 +71,7 @@ class NameDictionaryLookupStub: public PlatformCodeStub {
                                      Register r0,
                                      Register r1);
 
-  virtual bool SometimesSetsUpAFrame() { return false; }
+  bool SometimesSetsUpAFrame() OVERRIDE { return false; }
 
  private:
   static const int kInlinedProbes = 4;
@@ -134,7 +134,7 @@ class RecordWriteStub: public PlatformCodeStub {
     INCREMENTAL_COMPACTION
   };
 
-  virtual bool SometimesSetsUpAFrame() { return false; }
+  bool SometimesSetsUpAFrame() OVERRIDE { return false; }
 
   static const byte kTwoByteNopInstruction = 0x3c;  // Cmpb al, #imm8.
   static const byte kTwoByteJumpInstruction = 0xeb;  // Jmp #imm8.
@@ -313,9 +313,9 @@ class RecordWriteStub: public PlatformCodeStub {
     kUpdateRememberedSetOnNoNeedToInformIncrementalMarker
   };
 
-  virtual Major MajorKey() const FINAL OVERRIDE { return RecordWrite; }
+  Major MajorKey() const FINAL { return RecordWrite; }
 
-  virtual void Generate(MacroAssembler* masm) OVERRIDE;
+  void Generate(MacroAssembler* masm) OVERRIDE;
   void GenerateIncremental(MacroAssembler* masm, Mode mode);
   void CheckNeedsToInformIncrementalMarker(
       MacroAssembler* masm,
@@ -323,7 +323,7 @@ class RecordWriteStub: public PlatformCodeStub {
       Mode mode);
   void InformIncrementalMarker(MacroAssembler* masm);
 
-  void Activate(Code* code) {
+  void Activate(Code* code) OVERRIDE {
     code->GetHeap()->incremental_marking()->ActivateGeneratedStub(code);
   }