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

src/v8-counters.cc

 // Copyright 2007-2008 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 11 matching lines @@
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // 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 "v8-counters.h"
 
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 
 #define HT(name, caption) \
   HistogramTimer Counters::name = { #caption, NULL, false, 0, 0 }; \
 
   HISTOGRAM_TIMER_LIST(HT)
 #undef SR
 
 #define SC(name, caption) \
   StatsCounter Counters::name = { "c:" #caption, NULL, false };
 
   STATS_COUNTER_LIST_1(SC)
   STATS_COUNTER_LIST_2(SC)
 #undef SC
 
 StatsCounter Counters::state_counters[] = {
 #define COUNTER_NAME(name) \
   { "c:V8.State" #name, NULL, false },
   STATE_TAG_LIST(COUNTER_NAME)
 #undef COUNTER_NAME
 };
 
 } }  // namespace v8::internal