Cleanup include guards:

src/arm/regexp-macro-assembler-arm.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
 //       with the distribution.
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 //       contributors may be used to endorse or promote products derived
 //       from this software without specific prior written permission.
 //
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-#ifndef REGEXP_MACRO_ASSEMBLER_ARM_H_
-#define REGEXP_MACRO_ASSEMBLER_ARM_H_
+#ifndef V8_ARM_REGEXP_MACRO_ASSEMBLER_ARM_H_
+#define V8_ARM_REGEXP_MACRO_ASSEMBLER_ARM_H_
 
 namespace v8 { namespace internal {
 
 class RegExpMacroAssemblerARM: public RegExpMacroAssembler {
  public:
   RegExpMacroAssemblerARM();
   virtual ~RegExpMacroAssemblerARM();
 };
 
 }}  // namespace v8::internal
 
-#endif /* REGEXP_MACRO_ASSEMBLER_ARM_H_ */
+#endif  // V8_ARM_REGEXP_MACRO_ASSEMBLER_ARM_H_