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

src/x64/codegen-x64.cc

 // Copyright 2009 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 13 matching lines @@
 // 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.
 
 
 #include "v8.h"
 #include "macro-assembler.h"
 #include "register-allocator-inl.h"
 #include "codegen.h"
 
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 
 CodeGenerator::CodeGenerator(int buffer_size,
                              Handle<Script> script,
                              bool is_eval)
     : is_eval_(is_eval),
       script_(script),
       deferred_(8),
       masm_(new MacroAssembler(NULL, buffer_size)),
       scope_(NULL),
       frame_(NULL),
@@ skipping 183 matching lines @@
   masm->int3();  // TODO(X64): UNIMPLEMENTED.
 }
 
 void JSEntryStub::GenerateBody(MacroAssembler* masm, bool is_construct) {
   masm->int3();  // TODO(X64): UNIMPLEMENTED.
 }
 
 
 
 } }  // namespace v8::internal