Consistently use only one of virtual/OVERRIDE/FINAL.

src/string-stream.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_STRING_STREAM_H_
 #define V8_STRING_STREAM_H_
 
 #include "src/handles.h"
 
 namespace v8 {
 namespace internal {
 
 class StringAllocator {
  public:
   virtual ~StringAllocator() { }
   // Allocate a number of bytes.
   virtual char* allocate(unsigned bytes) = 0;
   // Allocate a larger number of bytes and copy the old buffer to the new one.
   // bytes is an input and output parameter passing the old size of the buffer
   // and returning the new size.  If allocation fails then we return the old
   // buffer and do not increase the size.
   virtual char* grow(unsigned* bytes) = 0;
 };
 
 
 // Normal allocator uses new[] and delete[].
 class HeapStringAllocator FINAL : public StringAllocator {
  public:
   ~HeapStringAllocator() { DeleteArray(space_); }
-  virtual char* allocate(unsigned bytes) OVERRIDE;
-  virtual char* grow(unsigned* bytes) OVERRIDE;
+  char* allocate(unsigned bytes) OVERRIDE;
+  char* grow(unsigned* bytes) OVERRIDE;
 
  private:
   char* space_;
 };
 
 
 class FmtElm FINAL {
  public:
   FmtElm(int value) : type_(INT) {  // NOLINT
     data_.u_int_ = value;
@@ skipping 107 matching lines @@
 
   bool full() const { return (capacity_ - length_) == 1; }
   int space() const { return capacity_ - length_; }
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(StringStream);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_STRING_STREAM_H_