Build third-party code with -Wall, build chromium_code with -Wextra on Linux

chromecast/crash/linux/dump_info.h

 // 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.
 
 #ifndef CHROMECAST_CRASH_LINUX_DUMP_INFO_H_
 #define CHROMECAST_CRASH_LINUX_DUMP_INFO_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 44 matching lines @@
   //   "suffix": <suffix>,
   //   "prev_app_name": <prev_app_name>,
   //   "cur_app_name": <current_app_name>,
   //   "last_app_name": <last_app_name>,
   //   "release_version": <release_version>,
   //   "build_number": <build_number>
   //   "reason": <reason>
   // }
   scoped_ptr<base::Value> GetAsValue() const;
   const MinidumpParams& params() const { return params_; }
-  const bool valid() const { return valid_; }
+  bool valid() const { return valid_; }
 
  private:
   // Checks if parsed JSON in |value| is valid, if so populates the object's
   // fields from |value|.
   bool ParseEntry(const base::Value* value);
   bool SetDumpTimeFromString(const std::string& timestr);
 
   std::string crashed_process_dump_;
   std::string logfile_;
   time_t dump_time_;
   MinidumpParams params_;
   bool valid_;
 
   DISALLOW_COPY_AND_ASSIGN(DumpInfo);
 };
 
 }  // namespace chromecast
 
 #endif  // CHROMECAST_CRASH_LINUX_DUMP_INFO_H_