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

src/arm/cpu-arm.cc

 // 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
@@ skipping 16 matching lines @@
 
 // CPU specific code for arm independent of OS goes here.
 #if defined(__arm__)
 #include <sys/syscall.h>  // for cache flushing.
 #endif
 
 #include "v8.h"
 
 #include "cpu.h"
 
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 
 void CPU::Setup() {
   // Nothing to do.
 }
 
 
 void CPU::FlushICache(void* start, size_t size) {
 #if !defined (__arm__)
   // Not generating ARM instructions for C-code. This means that we are
   // building an ARM emulator based target. No I$ flushes are necessary.
@@ skipping 67 matching lines @@
 
 void CPU::DebugBreak() {
 #if !defined (__arm__)
   UNIMPLEMENTED();  // when building ARM emulator target
 #else
   asm volatile("bkpt 0");
 #endif
 }
 
 } }  // namespace v8::internal