Update {virtual,override} to follow C++11 style in courgette.

courgette/disassembler_elf_32_x86.h

 // Copyright (c) 2011 The Chromium 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 COURGETTE_DISASSEMBLER_ELF_32_X86_H_
 #define COURGETTE_DISASSEMBLER_ELF_32_X86_H_
 
 #include "base/basictypes.h"
 #include "courgette/disassembler_elf_32.h"
 #include "courgette/memory_allocator.h"
 #include "courgette/types_elf.h"
 
 namespace courgette {
 
 class AssemblyProgram;
 
 class DisassemblerElf32X86 : public DisassemblerElf32 {
  public:
   class TypedRVAX86 : public TypedRVA {
    public:
     explicit TypedRVAX86(RVA rva) : TypedRVA(rva) {
     }
 
-    virtual CheckBool ComputeRelativeTarget(const uint8* op_pointer) override {
+    CheckBool ComputeRelativeTarget(const uint8* op_pointer) override {
       set_relative_target(Read32LittleEndian(op_pointer) + 4);
       return true;
     }
 
-    virtual CheckBool EmitInstruction(AssemblyProgram* program,
-                                       RVA target_rva) override {
+    CheckBool EmitInstruction(AssemblyProgram* program,
+                              RVA target_rva) override {
       return program->EmitRel32(program->FindOrMakeRel32Label(target_rva));
     }
 
-    virtual uint16 op_size() const override { return 4; }
+    uint16 op_size() const override { return 4; }
   };
 
   explicit DisassemblerElf32X86(const void* start, size_t length);
 
   virtual ExecutableType kind() { return EXE_ELF_32_X86; }
 
   virtual e_machine_values ElfEM() { return EM_386; }
 
  protected:
   virtual CheckBool RelToRVA(Elf32_Rel rel, RVA* result)
       const WARN_UNUSED_RESULT;
 
   virtual CheckBool ParseRelocationSection(
       const Elf32_Shdr *section_header,
       AssemblyProgram* program) WARN_UNUSED_RESULT;
 
   virtual CheckBool ParseRel32RelocsFromSection(
       const Elf32_Shdr* section) WARN_UNUSED_RESULT;
 
 #if COURGETTE_HISTOGRAM_TARGETS
   std::map<RVA, int> rel32_target_rvas_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(DisassemblerElf32X86);
 };
 
 }  // namespace courgette
 
 #endif  // COURGETTE_DISASSEMBLER_ELF_32_X86_H_