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

src/prettyprinter.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 15 matching lines @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include <stdarg.h>
 
 #include "v8.h"
 
 #include "prettyprinter.h"
 #include "scopes.h"
 #include "platform.h"
 
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 
 #ifdef DEBUG
 
 PrettyPrinter::PrettyPrinter() {
   output_ = NULL;
   size_ = 0;
   pos_ = 0;
 }
 
 
@@ skipping 1046 matching lines @@
 
 void AstPrinter::VisitThisFunction(ThisFunction* node) {
   IndentedScope indent("THIS-FUNCTION");
 }
 
 
 
 #endif  // DEBUG
 
 } }  // namespace v8::internal