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

src/spaces-inl.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 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.
 
 #ifndef V8_SPACES_INL_H_
 #define V8_SPACES_INL_H_
 
 #include "memory.h"
 #include "spaces.h"
 
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 
 
 // -----------------------------------------------------------------------------
 // HeapObjectIterator
 
 bool HeapObjectIterator::has_next() {
   if (cur_addr_ < cur_limit_) {
     return true;  // common case
   }
   ASSERT(cur_addr_ == cur_limit_);
@@ skipping 310 matching lines @@
   ASSERT(space->low() <= alloc_info->top
          && alloc_info->top <= space->high()
          && alloc_info->limit == space->high());
 #endif
   return obj;
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_SPACES_INL_H_