Move several annotations to annotations package.

base/android/java/src/org/chromium/base/CalledByNativeUnchecked.java

-// Copyright 2012 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.base;
-
-import java.lang.annotation.ElementType;
-import java.lang.annotation.Retention;
-import java.lang.annotation.RetentionPolicy;
-import java.lang.annotation.Target;
-
-/**
- *  @CalledByNativeUnchecked is used to generate JNI bindings that do not check for exceptions.
- *  It only makes sense to use this annotation on methods that declare a throws... spec.
- *  However, note that the exception received native side maybe an 'unchecked' (RuntimeExpception)
- *  such as NullPointerException, so the native code should differentiate these cases.
- *  Usage of this should be very rare; where possible handle exceptions in the Java side and use a
- *  return value to indicate success / failure.
- */
-@Target(ElementType.METHOD)
-@Retention(RetentionPolicy.CLASS)
-public @interface CalledByNativeUnchecked {
-    /*
-     *  If present, tells which inner class the method belongs to.
-     */
-    public String value() default "";
-}