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

src/rewriter.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 14 matching lines @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include "v8.h"
 
 #include "ast.h"
 #include "func-name-inferrer.h"
 #include "scopes.h"
 #include "rewriter.h"
 
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 
 
 class AstOptimizer: public AstVisitor {
  public:
   explicit AstOptimizer() {}
   explicit AstOptimizer(Handle<String> enclosing_name) {
     func_name_inferrer_.PushEnclosingName(enclosing_name);
   }
 
   void Optimize(ZoneList<Statement*>* statements);
@@ skipping 783 matching lines @@
     optimizer.Optimize(body);
     if (optimizer.HasStackOverflow()) {
       return false;
     }
   }
   return true;
 }
 
 
 } }  // namespace v8::internal