Update to newer Android Lint and suppress new Lint errors

ui/android/java/src/org/chromium/ui/base/Clipboard.java

 // Copyright 2013 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.base;
 
+import android.annotation.SuppressLint;
 import android.content.ClipData;
 import android.content.ClipDescription;
 import android.content.ClipboardManager;
 import android.content.Context;
 import android.text.Html;
 import android.text.Spanned;
 import android.text.style.CharacterStyle;
 import android.text.style.ParagraphStyle;
 import android.text.style.UpdateAppearance;
 
 import org.chromium.base.ApiCompatibilityUtils;
 import org.chromium.base.ContextUtils;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
 import org.chromium.base.annotations.SuppressFBWarnings;
 import org.chromium.base.metrics.RecordUserAction;
 import org.chromium.ui.R;
 import org.chromium.ui.widget.Toast;
 
 /**
  * Simple proxy that provides C++ code with an access pathway to the Android clipboard.
  */
 @JNINamespace("ui")
 public class Clipboard implements ClipboardManager.OnPrimaryClipChangedListener {
+    @SuppressLint("StaticFieldLeak")
     private static Clipboard sInstance;
 
     // Necessary for coercing clipboard contents to text if they require
     // access to network resources, etceteras (e.g., URI in clipboard)
     private final Context mContext;
 
     private final ClipboardManager mClipboardManager;
 
     /**
      * Get the singleton Clipboard instance (creating it if needed).
@@ skipping 147 matching lines @@
     @Override
     public void onPrimaryClipChanged() {
         RecordUserAction.record("MobileClipboardChanged");
         long nativeClipboardAndroid = nativeInit();
         if (nativeClipboardAndroid != 0) nativeOnPrimaryClipChanged(nativeClipboardAndroid);
     }
 
     private native long nativeInit();
     private native void nativeOnPrimaryClipChanged(long nativeClipboardAndroid);
 }