Remove unused Interests code.

chrome/android/java/res/layout/new_tab_page_view.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- 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. -->
 
 <org.chromium.chrome.browser.ntp.NewTabPageView
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:paddingTop="@dimen/tab_strip_height" >
@@ skipping 31 matching lines @@
                 android:layout_width="wrap_content"
                 android:layout_height="match_parent"
                 android:layout_gravity="center_horizontal"
                 android:drawablePadding="8dp"
                 android:gravity="center_vertical"
                 android:text="@null"
                 android:textSize="12sp"
                 android:textColor="#5a5a5a" />
         </FrameLayout>
         <FrameLayout
-            android:id="@+id/interests_button"
-            android:layout_width="0dp"
-            android:layout_height="match_parent"
-            android:layout_weight="1"
-            android:background="?attr/listChoiceBackgroundIndicator"
-            android:contentDescription="@string/accessibility_ntp_toolbar_btn_interests"
-            android:paddingBottom="12dp"
-            android:paddingTop="12dp"
-            android:visibility="gone" >
-            <TextView
-                android:layout_gravity="center_horizontal"
-                android:layout_height="match_parent"
-                android:layout_width="wrap_content"
-                android:drawablePadding="8dp"
-                android:gravity="center_vertical"
-                android:text="@string/ntp_interests"
-                android:textColor="#5a5a5a"
-                android:textSize="12sp" />
-        </FrameLayout>
-        <FrameLayout
             android:id="@+id/recent_tabs_button"
             android:layout_width="0dp"
             android:layout_height="match_parent"
             android:layout_weight="1"
             android:background="?attr/listChoiceBackgroundIndicator"
             android:contentDescription="@string/accessibility_ntp_toolbar_btn_recent_tabs"
             android:paddingTop="12dp"
             android:paddingBottom="12dp" >
             <TextView
                 android:layout_width="wrap_content"
                 android:layout_height="match_parent"
                 android:layout_gravity="center_horizontal"
                 android:drawablePadding="8dp"
                 android:gravity="center_vertical"
                 android:text="@string/recent_tabs"
                 android:textSize="12sp"
                 android:textColor="#5a5a5a" />
         </FrameLayout>
     </org.chromium.chrome.browser.ntp.NewTabPageToolbar>
 </org.chromium.chrome.browser.ntp.NewTabPageView>