user/src/com/google/gwt/storage/Storage.gwt.xml

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<!-- Copyright 2011 Google Inc.                                             -->
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<module>
  <inherits name='com.google.gwt.event.EventBase'/>
  <inherits name='com.google.gwt.useragent.UserAgent'/>

  <source path="client" />

  <replace-with class="com.google.gwt.storage.client.StorageImplNonNativeEvents">
    <when-type-is class="com.google.gwt.storage.client.StorageImpl" />
    <any>
      <when-property-is name="user.agent" value="safari" />
      <when-property-is name="user.agent" value="ie9" />
      <when-property-is name="user.agent" value="ie10" />
      <when-property-is name="user.agent" value="gecko1_8" />
    </any>
  </replace-with>

  <replace-with class="com.google.gwt.storage.client.StorageImplIE8">
    <when-type-is class="com.google.gwt.storage.client.StorageImpl" />
    <when-property-is name="user.agent" value="ie8" />
  </replace-with>
</module>