Fixed random style violations.

src/arm/assembler-arm.h

Index: src/arm/assembler-arm.h
===================================================================
--- src/arm/assembler-arm.h	(revision 3798)
+++ src/arm/assembler-arm.h	(working copy)
@@ -80,7 +80,7 @@
     return 1 << code_;
   }
 
-  // (unfortunately we can't make this private in a struct)
+  // Unfortunately we can't make this private in a struct.
   int code_;
 };
 
@@ -205,7 +205,7 @@
     return 1 << code_;
   }
 
-  // (unfortunately we can't make this private in a struct)
+  // Unfortunately we can't make this private in a struct.
   int code_;
 };