Fix linux/gcc compiler warnings in tools/ipc_fuzzer.

tools/ipc_fuzzer/message_lib/message_file_format.h

 // Copyright 2013 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 TOOLS_IPC_FUZZER_MESSAGE_LIB_MESSAGE_FILE_FORMAT_H_
 #define TOOLS_IPC_FUZZER_MESSAGE_LIB_MESSAGE_FILE_FORMAT_H_
 
 #include "base/basictypes.h"
 
 // Message file contains IPC messages and message names. Each message type
 // has a NameTableEntry mapping the type to a name.
 //
 // |========================|
 // | FileHeader             |
 // |========================|
 // | Message                |
 // |------------------------|
 // | Message                |
 // |------------------------|
 // | ...                    |
 // |========================|
 // | NameTableEntry         |
 // |------------------------|
 // | NameTableEntry         |
 // |------------------------|
 // | ...                    |
 // |------------------------|
 // | type = 0x0002070f      |
-// | string_table_offset = ---.
-// |------------------------|  \
+// | string_table_offset = ----+
+// |------------------------|  |
 // | ...                    |  |
 // |========================|  |
 // | message name           |  |
 // |------------------------|  |
 // | message name           |  |
 // |------------------------|  |
 // | ...                    |  |
-// |------------------------|  /
-// | "ViewHostMsg_OpenURL" <--*
+// |------------------------|  |
+// | "ViewHostMsg_OpenURL" <---+
 // |------------------------|
 // | ...                    |
 // |========================|
 
 namespace ipc_fuzzer {
 
 struct FileHeader {
   static const uint32 kMagicValue = 0x1bcf11ee;
   static const uint32 kCurrentVersion = 1;
 
   uint32 magic;
   uint32 version;
   uint32 message_count;
   uint32 name_count;
 };
 
 struct NameTableEntry {
   uint32 type;
   uint32 string_table_offset;
 };
 
 }  // namespace ipc_fuzzer
 
 #endif  // TOOLS_IPC_FUZZER_MESSAGE_LIB_MESSAGE_FILE_FORMAT_H_