ui: Cleanup class/struct forward declarations

ui/android/java/src/org/chromium/ui/picker/ChromeDatePickerDialog.java

Index: ui/android/java/src/org/chromium/ui/picker/ChromeDatePickerDialog.java
diff --git a/ui/android/java/src/org/chromium/ui/picker/ChromeDatePickerDialog.java b/ui/android/java/src/org/chromium/ui/picker/ChromeDatePickerDialog.java
deleted file mode 100644
index e3c1e27d13313af27df94b375848bca8043da44f..0000000000000000000000000000000000000000
--- a/ui/android/java/src/org/chromium/ui/picker/ChromeDatePickerDialog.java
+++ /dev/null
@@ -1,56 +0,0 @@
-// Copyright 2014 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.
-
-package org.chromium.ui.picker;
-
-import android.app.DatePickerDialog;
-import android.content.Context;
-import android.content.DialogInterface;
-import android.os.Build;
-import android.widget.DatePicker;
-
-/**
- * The behavior of the DatePickerDialog changed after JellyBean so it now calls
- * OndateSetListener.onDateSet() even when the dialog is dismissed (e.g. back button, tap
- * outside). This class will call the listener instead of the DatePickerDialog only when the
- * BUTTON_POSITIVE has been clicked.
- */
-class ChromeDatePickerDialog extends DatePickerDialog {
-    private final OnDateSetListener mCallBack;
-
-    public ChromeDatePickerDialog(Context context,
-            OnDateSetListener callBack,
-            int year,
-            int monthOfYear,
-            int dayOfMonth) {
-        super(context, callBack, year, monthOfYear, dayOfMonth);
-
-        mCallBack = callBack;
-    }
-
-    /**
-     * The superclass DatePickerDialog has null for OnDateSetListener so we need to call the
-     * listener manually.
-     */
-    @Override
-    public void onClick(DialogInterface dialog, int which) {
-        if (which == BUTTON_POSITIVE && mCallBack != null) {
-            DatePicker datePicker = getDatePicker();
-            datePicker.clearFocus();
-            mCallBack.onDateSet(datePicker, datePicker.getYear(),
-                    datePicker.getMonth(), datePicker.getDayOfMonth());
-        }
-    }
-
-    @Override
-    public void setTitle(CharSequence title) {
-        // On Android L+, the dialog shouldn't have a title. This works around a bug in
-        // DatePickerDialog where calling updateDate() before the dialog has been shown causes
-        // a title to appear. http://crbug.com/541350
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
-            title = "";
-        }
-        super.setTitle(title);
-    }
-}