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

src/mark-compact.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 15 matching lines @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include "v8.h"
 
 #include "execution.h"
 #include "global-handles.h"
 #include "ic-inl.h"
 #include "mark-compact.h"
 #include "stub-cache.h"
 
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 
 // -------------------------------------------------------------------------
 // MarkCompactCollector
 
 bool MarkCompactCollector::compacting_collection_ = false;
 
 int MarkCompactCollector::previous_marked_count_ = 0;
 GCTracer* MarkCompactCollector::tracer_ = NULL;
 
 
@@ skipping 1747 matching lines @@
 
 void MarkCompactCollector::RebuildRSets() {
 #ifdef DEBUG
   ASSERT(state_ == RELOCATE_OBJECTS);
   state_ = REBUILD_RSETS;
 #endif
   Heap::RebuildRSets();
 }
 
 } }  // namespace v8::internal