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

src/arm/frames-arm.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 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_ARM_FRAMES_ARM_H_
 #define V8_ARM_FRAMES_ARM_H_
 
-namespace v8 { namespace internal {
+namespace v8 {
+namespace internal {
 
 
 // The ARM ABI does not specify the usage of register r9, which may be reserved
 // as the static base or thread register on some platforms, in which case we
 // leave it alone. Adjust the value of kR9Available accordingly:
 static const int kR9Available = 1;  // 1 if available to us, 0 if reserved
 
 
 // Register list in load/store instructions
 // Note that the bit values must match those used in actual instruction encoding
@@ skipping 328 matching lines @@
   //             |   caller    |
   //             | expressions |
   //             |             |
   //   higher    |             |
   //  addresses  |  JS frame   |
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_FRAMES_ARM_H_