Fix multiple IPC fuzzer compile failures.

tools/ipc_fuzzer/fuzzer/fuzzer.cc

 // Copyright 2015 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.
 
 #include <iostream>
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 892 matching lines @@
       case 2: {
         *p = content::IndexedDBKeyPath();
         break;
       }
     }
     return true;
   }
 };
 
 template <>
-struct FuzzTraits<content::NPIdentifier_Param> {
-  static bool Fuzz(content::NPIdentifier_Param* p, Fuzzer* fuzzer) {
-    // TODO(mbarbella): This should actually do something.
-    return true;
-  }
-};
-
-template <>
-struct FuzzTraits<content::NPVariant_Param> {
-  static bool Fuzz(content::NPVariant_Param* p, Fuzzer* fuzzer) {
-    // TODO(mbarbella): This should actually do something.
-    return true;
-  }
-};
-
-template <>
 struct FuzzTraits<content::PageState> {
   static bool Fuzz(content::PageState* p, Fuzzer* fuzzer) {
     std::string data = p->ToEncodedData();
     if (!FuzzParam(&data, fuzzer))
       return false;
     *p = content::PageState::CreateFromEncodedData(data);
     return true;
   }
 };
 
@@ skipping 1200 matching lines @@
 #include "tools/ipc_fuzzer/message_lib/all_message_null_macros.h"
 #undef IPC_MESSAGE_DECL
 #define IPC_MESSAGE_DECL(name, ...) \
   (*map)[static_cast<uint32_t>(name::ID)] = FuzzerHelper<name>::Fuzz;
 
 void PopulateFuzzerFunctionMap(FuzzerFunctionMap* map) {
 #include "tools/ipc_fuzzer/message_lib/all_messages.h"
 }
 
 }  // namespace ipc_fuzzer