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

src/scanner.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 12 matching lines @@
 // 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 "ast.h"
 #include "scanner.h"
 
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 
 // ----------------------------------------------------------------------------
 // Character predicates
 
 
 unibrow::Predicate<IdentifierStart, 128> Scanner::kIsIdentifierStart;
 unibrow::Predicate<IdentifierPart, 128> Scanner::kIsIdentifierPart;
 unibrow::Predicate<unibrow::LineTerminator, 128> Scanner::kIsLineTerminator;
 unibrow::Predicate<unibrow::WhiteSpace, 128> Scanner::kIsWhiteSpace;
 
@@ skipping 881 matching lines @@
     }
     AddCharAdvance();
   }
   TerminateLiteral();
 
   next_.location.end_pos = source_pos() - 1;
   return true;
 }
 
 } }  // namespace v8::internal