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

src/interpreter-irregexp.cc

 // Copyright 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 18 matching lines @@
 
 
 #include "v8.h"
 #include "unicode.h"
 #include "utils.h"
 #include "ast.h"
 #include "bytecodes-irregexp.h"
 #include "interpreter-irregexp.h"
 
 
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 
 
 static unibrow::Mapping<unibrow::Ecma262Canonicalize> interp_canonicalize;
 
 
 static bool BackRefMatchesNoCase(int from,
                                  int current,
                                  int len,
                                  Vector<const uc16> subject) {
   for (int i = 0; i < len; i++) {
@@ skipping 537 matching lines @@
     if (start_position != 0) previous_char = subject_vector[start_position - 1];
     return RawMatch(code_base,
                     subject_vector,
                     registers,
                     start_position,
                     previous_char);
   }
 }
 
 } }  // namespace v8::internal