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

src/serialize.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 21 matching lines @@
 #include "execution.h"
 #include "global-handles.h"
 #include "ic-inl.h"
 #include "natives.h"
 #include "platform.h"
 #include "runtime.h"
 #include "serialize.h"
 #include "stub-cache.h"
 #include "v8threads.h"
 
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 
 // Encoding: a RelativeAddress must be able to fit in a pointer:
 // it is encoded as an Address with (from MS to LS bits):
 // 27 bits identifying a word in the space, in one of three formats:
 // - MAP and OLD spaces: 16 bits of page number, 11 bits of word offset in page
 // - NEW space:          27 bits of word offset
 // - LO space:           27 bits of page number
 // 3 bits to encode the AllocationSpace (special values for code in LO space)
 // 2 bits identifying this as a HeapObject
 
@@ skipping 1559 matching lines @@
         ASSERT(index < large_objects_.length());
       }
       return large_objects_[index];  // s.page_offset() is ignored.
   }
   UNREACHABLE();
   return NULL;
 }
 
 
 } }  // namespace v8::internal