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

chrome/browser/android/download/download_controller.h

Index: chrome/browser/android/download/download_controller.h
diff --git a/chrome/browser/android/download/download_controller.h b/chrome/browser/android/download/download_controller.h
index ceeb0a2ff8574b70b31ed905bffd9e793e141422..163e815daa80f5bafac9c06f2c25c89bbc403f03 100644
--- a/chrome/browser/android/download/download_controller.h
+++ b/chrome/browser/android/download/download_controller.h
@@ -76,10 +76,6 @@ class DownloadController : public DownloadControllerBase {
   bool HasFileAccessPermission(ui::WindowAndroid* window_android);
 
   // DownloadControllerBase implementation.
-  void CreateGETDownload(
-      const content::ResourceRequestInfo::WebContentsGetter& wc_getter,
-      bool must_download,
-      const DownloadInfo& info) override;
   void OnDownloadStarted(content::DownloadItem* download_item) override;
   void StartContextMenuDownload(const content::ContextMenuParams& params,
                                 content::WebContents* web_contents,
@@ -92,16 +88,6 @@ class DownloadController : public DownloadControllerBase {
   // DownloadItem::Observer interface.
   void OnDownloadUpdated(content::DownloadItem* item) override;
 
-  void StartAndroidDownload(
-      const content::ResourceRequestInfo::WebContentsGetter& wc_getter,
-      bool must_download,
-      const DownloadInfo& info);
-  void StartAndroidDownloadInternal(
-      const content::ResourceRequestInfo::WebContentsGetter& wc_getter,
-      bool must_download,
-      const DownloadInfo& info,
-      bool allowed);
-
   // The download item contains dangerous file types.
   void OnDangerousDownload(content::DownloadItem *item);