Fix "unused variable" warnings.

base/android/trace_event_binding.cc

 // Copyright 2014 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 "base/android/trace_event_binding.h"
 
 #include <jni.h>
 
 #include <set>
 
@@ skipping 10 matching lines @@
 namespace {
 
 const char kJavaCategory[] = "Java";
 const char kToplevelCategory[] = "toplevel";
 const char kLooperDispatchMessage[] = "Looper.dispatchMessage";
 
 // Boilerplate for safely converting Java data to TRACE_EVENT data.
 class TraceEventDataConverter {
  public:
   TraceEventDataConverter(JNIEnv* env, jstring jname, jstring jarg)
-      : env_(env),
-        jname_(jname),
-        jarg_(jarg),
-        name_(ConvertJavaStringToUTF8(env, jname)),
+      : name_(ConvertJavaStringToUTF8(env, jname)),
         has_arg_(jarg != nullptr),
         arg_(jarg ? ConvertJavaStringToUTF8(env, jarg) : "") {}
   ~TraceEventDataConverter() {
   }
 
   // Return saves values to pass to TRACE_EVENT macros.
   const char* name() { return name_.c_str(); }
   const char* arg_name() { return has_arg_ ? "arg" : nullptr; }
   const char* arg() { return has_arg_ ? arg_.c_str() : nullptr; }
 
  private:
-  JNIEnv* env_;
-  jstring jname_;
-  jstring jarg_;
   std::string name_;
   bool has_arg_;
   std::string arg_;
 
   DISALLOW_COPY_AND_ASSIGN(TraceEventDataConverter);
 };
 
 class TraceEnabledObserver
     : public trace_event::TraceLog::EnabledStateObserver {
   public:
@@ skipping 91 matching lines @@
   TraceEventDataConverter converter(env, jname, nullptr);
   TRACE_EVENT_COPY_ASYNC_END0(kJavaCategory, converter.name(), jid);
 }
 
 bool RegisterTraceEvent(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android
 }  // namespace base