Revert of [Android] Make enhanced bookmark editing UI more straightforward.

chrome/android/java/src/org/chromium/chrome/browser/widget/EmptyAlertEditText.java

 // 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.
 
 package org.chromium.chrome.browser.widget;
 
 import android.content.Context;
 import android.content.res.TypedArray;
 import android.support.v7.widget.AppCompatEditText;
 import android.text.Editable;
@@ skipping 25 matching lines @@
         super.onFinishInflate();
         addTextChangedListener(new TextWatcher() {
             @Override
             public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
 
             @Override
             public void onTextChanged(CharSequence s, int start, int before, int count) {}
 
             @Override
             public void afterTextChanged(Editable s) {
-                if (isEmpty()) {
-                    if (getError() != null) setError(null);
-                } else {
-                    setError(mAlertMessage);
-                }
+                if (s.toString().trim().length() != 0 && getError() != null) setError(null);
             }
         });
     }
 
     /**
      * @return Trimmed text for validation.
      */
     public String getTrimmedText() {
         return getText().toString().trim();
     }
 
     /**
      * Sets the alert message to be shown when the text content is empty.
      */
     public void setAlertMessage(String message) {
         mAlertMessage = message;
     }
 
     /**
+     * Checks whether the content is empty. If empty, an alert message will be shown.
      * @return Whether the content is empty.
      */
-    public boolean isEmpty() {
-        return getTrimmedText().length() > 0;
+    public boolean validate() {
+        if (getTrimmedText().length() == 0) {
+            setError(mAlertMessage);
+            return false;
+        }
+        return true;
     }
 }