Add missing using statements for JNI types.

android_webview/native/aw_debug.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 "android_webview/native/aw_debug.h"
 
 #include "android_webview/crash_reporter/aw_microdump_crash_reporter.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/debug/dump_without_crashing.h"
 #include "base/files/file.h"
 #include "base/files/file_path.h"
 #include "base/threading/thread_restrictions.h"
 #include "jni/AwDebug_jni.h"
 
 using base::android::ConvertJavaStringToUTF16;
 using base::android::ConvertUTF8ToJavaString;
+using base::android::JavaParamRef;
 using base::android::ScopedJavaLocalRef;
 
 namespace android_webview {
 
 static jboolean DumpWithoutCrashing(JNIEnv* env,
                                     const JavaParamRef<jclass>& clazz,
                                     const JavaParamRef<jstring>& dump_path) {
   // This may be called from any thread, and we might be in a state
   // where it is impossible to post tasks, so we have to be prepared
   // to do IO from this thread.
   base::ThreadRestrictions::ScopedAllowIO allow_io;
   base::File target(base::FilePath(ConvertJavaStringToUTF8(env, dump_path)),
                     base::File::FLAG_OPEN_TRUNCATED | base::File::FLAG_READ |
                         base::File::FLAG_WRITE);
   if (!target.IsValid())
     return false;
   // breakpad_linux::HandleCrashDump will close this fd once it is done.
   return crash_reporter::DumpWithoutCrashingToFd(target.TakePlatformFile());
 }
 
 bool RegisterAwDebug(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android_webview