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

src/disassembler.h

 // 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 10 matching lines @@
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #ifndef V8_DISASSEMBLER_H_
 #define V8_DISASSEMBLER_H_
 
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 
 class Disassembler : public AllStatic {
  public:
   // Print the bytes in the interval [begin, end) into f.
   static void Dump(FILE* f, byte* begin, byte* end);
 
   // Decode instructions in the the interval [begin, end) and print the
   // code into f. Returns the number of bytes disassembled or 1 if no
   // instruction could be decoded.
   static int Decode(FILE* f, byte* begin, byte* end);
 
   // Decode instructions in code.
   static void Decode(FILE* f, Code* code);
  private:
   // Decode instruction at pc and print disassembled instruction into f.
   // Returns the instruction length in bytes, or 1 if the instruction could
   // not be decoded.  The number of characters written is written into
   // the out parameter char_count.
   static int Decode(FILE* f, byte* pc, int* char_count);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_DISASSEMBLER_H_