Consistently use only one of virtual/OVERRIDE/FINAL.

src/arm64/lithium-codegen-arm64.cc

Index: src/arm64/lithium-codegen-arm64.cc
diff --git a/src/arm64/lithium-codegen-arm64.cc b/src/arm64/lithium-codegen-arm64.cc
index 240b8f6df13cd61de3cfc5ae87430eab7d69dedc..76a9b62c9c1c9b25f1e98b688268746462137c27 100644
--- a/src/arm64/lithium-codegen-arm64.cc
+++ b/src/arm64/lithium-codegen-arm64.cc
@@ -5986,10 +5986,11 @@ void LCodeGen::DoLoadFieldByIndex(LLoadFieldByIndex* instr) {
           object_(object),
           index_(index) {
     }
-    virtual void Generate() OVERRIDE {
+    void Generate() OVERRIDE {
       codegen()->DoDeferredLoadMutableDouble(instr_, result_, object_, index_);
     }
-    virtual LInstruction* instr() OVERRIDE { return instr_; }
+    LInstruction* instr() OVERRIDE { return instr_; }
+
    private:
     LLoadFieldByIndex* instr_;
     Register result_;