[DevTools] Generate separate copies of inspector_protocol.

third_party/WebKit/Source/platform/inspector_protocol/Allocator_h.template

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef Allocator_h
-#define Allocator_h
+#ifndef {{"_".join(config.protocol.namespace)}}_Allocator_h
+#define {{"_".join(config.protocol.namespace)}}_Allocator_h
+
+{% for namespace in config.protocol.namespace %}
+namespace {{namespace}} {
+{% endfor %}
 
 enum NotNullTagEnum { NotNullLiteral };
 
 #define PROTOCOL_DISALLOW_NEW()                                 \
     private:                                                    \
         void* operator new(size_t) = delete;                    \
         void* operator new(size_t, NotNullTagEnum, void*) = delete; \
         void* operator new(size_t, void*) = delete;             \
     public:
 
 #define PROTOCOL_DISALLOW_COPY(ClassName) \
     private: \
         ClassName(const ClassName&) = delete; \
         ClassName& operator=(const ClassName&) = delete
 
-#endif /* Allocator_h */
+{% for namespace in config.protocol.namespace %}
+} // namespace {{namespace}}
+{% endfor %}
+
+#endif // !defined({{"_".join(config.protocol.namespace)}}_Allocator_h)