[android_webview] Hardcode the default text encoding to UTF-8.

android_webview/native/aw_resource.cc

 // Copyright (c) 2012 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_resource.h"
 
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
 #include "jni/AwResource_jni.h"
 
@@ skipping 12 matching lines @@
   return base::android::ConvertJavaStringToUTF8(content);
 }
 
 std::string GetNoDomainPageContent() {
   JNIEnv* env = base::android::AttachCurrentThread();
   ScopedJavaLocalRef<jstring> content =
       Java_AwResource_getNoDomainPageContent(env);
   return base::android::ConvertJavaStringToUTF8(content);
 }
 
-std::string GetDefaultTextEncoding() {
-  JNIEnv* env = base::android::AttachCurrentThread();
-  ScopedJavaLocalRef<jstring> encoding =
-      Java_AwResource_getDefaultTextEncoding(env);
-  return base::android::ConvertJavaStringToUTF8(encoding);
-}
-
 bool RegisterAwResource(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace AwResource
 }  // namespace android_webview