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

src/heap-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_HEAP_INL_H_
 #define V8_HEAP_INL_H_
 
 #include "log.h"
 #include "v8-counters.h"
 
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 
 int Heap::MaxHeapObjectSize() {
   return Page::kMaxHeapObjectSize;
 }
 
 
 Object* Heap::AllocateSymbol(Vector<const char> str,
                              int chars,
                              uint32_t length_field) {
   unibrow::Utf8InputBuffer<> buffer(str.start(),
@@ skipping 255 matching lines @@
   allocation_allowed_ = new_state;
   return old;
 }
 
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_INL_H_