Cleanup include guards:

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

Index: src/arm/regexp-macro-assembler-arm.h
diff --git a/src/arm/regexp-macro-assembler-arm.h b/src/arm/regexp-macro-assembler-arm.h
index 51352bc27516404f55d199f27ab17d4a41c731e1..2f38bb73ef9d99ecb4b777424439724cba12bde6 100644
--- a/src/arm/regexp-macro-assembler-arm.h
+++ b/src/arm/regexp-macro-assembler-arm.h
@@ -25,8 +25,8 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#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 {
 
@@ -38,4 +38,4 @@ class RegExpMacroAssemblerARM: public RegExpMacroAssembler {
 
 }}  // namespace v8::internal
 
-#endif /* REGEXP_MACRO_ASSEMBLER_ARM_H_ */
+#endif  // V8_ARM_REGEXP_MACRO_ASSEMBLER_ARM_H_