Remove DownloadController java weak reference

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 d085160a39f2f8502579524d00edb52eb5b8e3a9..bea8d4e3259dcb519d9c55d7f089cf1784f2a92e 100644
--- a/chrome/browser/android/download/download_controller.h
+++ b/chrome/browser/android/download/download_controller.h
@@ -33,9 +33,6 @@ class DownloadController : public DownloadControllerBase {
 
   static bool RegisterDownloadController(JNIEnv* env);
 
-  // Called when DownloadController Java object is instantiated.
-  void Init(JNIEnv* env, jobject obj);
-
   // DownloadControllerBase implementation.
   void AcquireFileAccessPermission(
       const content::ResourceRequestInfo::WebContentsGetter& wc_getter,
@@ -67,7 +64,6 @@ class DownloadController : public DownloadControllerBase {
       AcquirePermissionCallback;
 
  private:
-  struct JavaObject;
   friend struct base::DefaultSingletonTraits<DownloadController>;
   DownloadController();
   ~DownloadController() override;
@@ -99,11 +95,6 @@ class DownloadController : public DownloadControllerBase {
       const content::ResourceRequestInfo::WebContentsGetter& wc_getter,
       const DownloadInfo& info, bool allowed);
 
-  // Creates Java object if it is not created already and returns it.
-  JavaObject* GetJavaObject();
-
-  JavaObject* java_object_;
-
   std::string default_file_name_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadController);