Clean up Android DownloadManager code as most download now go through Chrome Network stack

chrome/browser/android/download/chrome_download_delegate.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 "chrome/browser/android/download/chrome_download_delegate.h"
 
 #include <jni.h>
 
 #include <string>
 #include <type_traits>
@@ skipping 124 matching lines @@
 
 ChromeDownloadDelegate::~ChromeDownloadDelegate() {
    JNIEnv* env = base::android::AttachCurrentThread();
    env->DeleteGlobalRef(java_ref_);
 }
 
 void ChromeDownloadDelegate::SetJavaRef(JNIEnv* env, jobject jobj) {
   java_ref_ = env->NewGlobalRef(jobj);
 }
 
-void ChromeDownloadDelegate::RequestHTTPGetDownload(
-    const std::string& url,
-    const std::string& user_agent,
-    const std::string& content_disposition,
-    const std::string& mime_type,
-    const std::string& cookie,
-    const std::string& referer,
-    const base::string16& file_name,
-    int64_t content_length,
-    bool has_user_gesture,
-    bool must_download) {
-  JNIEnv* env = base::android::AttachCurrentThread();
-  ScopedJavaLocalRef<jstring> jurl =
-      ConvertUTF8ToJavaString(env, url);
-  ScopedJavaLocalRef<jstring> juser_agent =
-      ConvertUTF8ToJavaString(env, user_agent);
-  ScopedJavaLocalRef<jstring> jcontent_disposition =
-      ConvertUTF8ToJavaString(env, content_disposition);
-  ScopedJavaLocalRef<jstring> jmime_type =
-      ConvertUTF8ToJavaString(env, mime_type);
-  ScopedJavaLocalRef<jstring> jcookie =
-      ConvertUTF8ToJavaString(env, cookie);
-  ScopedJavaLocalRef<jstring> jreferer =
-      ConvertUTF8ToJavaString(env, referer);
-
-  // net::GetSuggestedFilename will fallback to "download" as filename.
-  ScopedJavaLocalRef<jstring> jfilename =
-      base::android::ConvertUTF16ToJavaString(env, file_name);
-  Java_ChromeDownloadDelegate_requestHttpGetDownload(
-      env, java_ref_, jurl, juser_agent, jcontent_disposition, jmime_type,
-      jcookie, jreferer, has_user_gesture, jfilename, content_length,
-      must_download);
-}
-
-void ChromeDownloadDelegate::OnDownloadStarted(const std::string& filename,
-                                               const std::string& mime_type) {
+void ChromeDownloadDelegate::OnDownloadStarted(const std::string& filename) {
   JNIEnv* env = base::android::AttachCurrentThread();
   ScopedJavaLocalRef<jstring> jfilename = ConvertUTF8ToJavaString(
       env, filename);
-  ScopedJavaLocalRef<jstring> jmime_type =
-      ConvertUTF8ToJavaString(env, mime_type);
-  Java_ChromeDownloadDelegate_onDownloadStarted(env, java_ref_, jfilename,
-                                                jmime_type);
+  Java_ChromeDownloadDelegate_onDownloadStarted(env, java_ref_, jfilename);
 }
 
 void ChromeDownloadDelegate::OnDangerousDownload(const std::string& filename,
                                                  const std::string& guid) {
   JNIEnv* env = base::android::AttachCurrentThread();
   ScopedJavaLocalRef<jstring> jfilename = ConvertUTF8ToJavaString(
       env, filename);
   ScopedJavaLocalRef<jstring> jguid = ConvertUTF8ToJavaString(env, guid);
   Java_ChromeDownloadDelegate_onDangerousDownload(env, java_ref_, jfilename,
                                                   jguid);
@@ skipping 11 matching lines @@
   auto* web_contents = WebContents::FromJavaWebContents(jweb_contents);
   ChromeDownloadDelegate::CreateForWebContents(web_contents);
   ChromeDownloadDelegate::FromWebContents(web_contents)->SetJavaRef(env, obj);
 }
 
 bool RegisterChromeDownloadDelegate(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(ChromeDownloadDelegate);