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

src/ia32/regexp-macro-assembler-ia32.h

 // Copyright 2008-2009 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 10 matching lines @@
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // 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.
 
 #ifndef V8_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_
 #define V8_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_
 
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 
 class RegExpMacroAssemblerIA32: public RegExpMacroAssembler {
  public:
   // Type of input string to generate code for.
   enum Mode { ASCII = 1, UC16 = 2 };
   // Result of calling the generated RegExp code:
   // RETRY: Something significant changed during execution, and the matching
   //        should be retried from scratch.
   // EXCEPTION: Something failed during execution. If no exception has been
   //        thrown, it's an internal out-of-memory, and the caller should
@@ skipping 234 matching lines @@
   Label success_label_;
   Label backtrack_label_;
   Label exit_label_;
   Label check_preempt_label_;
   Label stack_overflow_label_;
 };
 
 }}  // namespace v8::internal
 
 #endif  // V8_IA32_REGEXP_MACRO_ASSEMBLER_IA32_H_