Split nested namespaces declaration in two lines in accordance with C++ Style Guide.

src/arm/disasm-arm.cc

 // Copyright 2007-2008 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
@@ skipping 44 matching lines @@
 #include <stdint.h>
 #endif
 
 #include "v8.h"
 
 #include "disasm.h"
 #include "macro-assembler.h"
 #include "platform.h"
 
 
-namespace assembler { namespace arm {
+namespace assembler {
+namespace arm {
 
 namespace v8i = v8::internal;
 
 
 //------------------------------------------------------------------------------
 
 // Decoder decodes and disassembles instructions into an output buffer.
 // It uses the converter to convert register names and call destinations into
 // more informative description.
 class Decoder {
@@ skipping 815 matching lines @@
     buffer[0] = '\0';
     byte* prev_pc = pc;
     pc += d.InstructionDecode(buffer, pc);
     fprintf(f, "%p    %08x      %s\n",
             prev_pc, *reinterpret_cast<int32_t*>(prev_pc), buffer.start());
   }
 }
 
 
 }  // namespace disasm