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

src/register-allocator-inl.h

 // 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 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.
 
 #ifndef V8_REGISTER_ALLOCATOR_INL_H_
 #define V8_REGISTER_ALLOCATOR_INL_H_
 
 #include "codegen.h"
 #include "register-allocator.h"
 #include "virtual-frame.h"
 
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 
 Result::~Result() {
   if (is_register()) {
     CodeGeneratorScope::Current()->allocator()->Unuse(reg());
   }
 }
 
 
 void Result::Unuse() {
   if (is_register()) {
     CodeGeneratorScope::Current()->allocator()->Unuse(reg());
   }
   invalidate();
 }
 
 
 void Result::CopyTo(Result* destination) const {
   destination->value_ = value_;
   if (is_register()) {
     CodeGeneratorScope::Current()->allocator()->Use(reg());
   }
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_REGISTER_ALLOCATOR_INL_H_