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

src/execution.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 25 matching lines @@
 #include "ia32/simulator-ia32.h"
 #elif V8_TARGET_ARCH_X64
 #include "x64/simulator-x64.h"
 #elif V8_TARGET_ARCH_ARM
 #include "arm/simulator-arm.h"
 #endif
 
 #include "debug.h"
 #include "v8threads.h"
 
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 
 
 static Handle<Object> Invoke(bool construct,
                              Handle<JSFunction> func,
                              Handle<Object> receiver,
                              int argc,
                              Object*** args,
                              bool* has_pending_exception) {
   // Make sure we have a real function, not a boilerplate function.
   ASSERT(!func->IsBoilerplate());
@@ skipping 601 matching lines @@
   // All allocation spaces other than NEW_SPACE have the same effect.
   Heap::CollectAllGarbage();
   return v8::Undefined();
 }
 
 
 static GCExtension kGCExtension;
 v8::DeclareExtension kGCExtensionDeclaration(&kGCExtension);
 
 } }  // namespace v8::internal