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

src/heap.cc

 // Copyright 2009 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 22 matching lines @@
 #include "codegen-inl.h"
 #include "compilation-cache.h"
 #include "debug.h"
 #include "global-handles.h"
 #include "mark-compact.h"
 #include "natives.h"
 #include "scanner.h"
 #include "scopeinfo.h"
 #include "v8threads.h"
 
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 
 #define ROOT_ALLOCATION(type, name) type* Heap::name##_;
   ROOT_LIST(ROOT_ALLOCATION)
 #undef ROOT_ALLOCATION
 
 
 #define STRUCT_ALLOCATION(NAME, Name, name) Map* Heap::name##_map_;
   STRUCT_LIST(STRUCT_ALLOCATION)
 #undef STRUCT_ALLOCATION
 
@@ skipping 3405 matching lines @@
 #ifdef DEBUG
 bool Heap::GarbageCollectionGreedyCheck() {
   ASSERT(FLAG_gc_greedy);
   if (Bootstrapper::IsActive()) return true;
   if (disallow_allocation_failure()) return true;
   return CollectGarbage(0, NEW_SPACE);
 }
 #endif
 
 } }  // namespace v8::internal