user/src/com/google/gwt/core/CoreWithUserAgent.gwt.xml

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<!-- Deferred binding rules for core classes based on user agent. -->
<module>
  <inherits name="com.google.gwt.core.Core"/>

  <!-- Disable source maps for non-Chrome browsers -->
  <!-- TODO(goktug): enable source maps for non-Chrome browsers -->
  <set-property name="compiler.useSourceMaps" value="false">
    <none> 
      <when-property-is name="user.agent" value="safari"/>
    </none> 
  </set-property>

  <replace-with class="com.google.gwt.core.client.impl.StackTraceCreator.CollectorModern">
    <when-type-is class="com.google.gwt.core.client.impl.StackTraceCreator.Collector" />
    <when-property-is name="compiler.stackMode" value="native" />
    <when-property-is name="user.agent" value="safari" />
    <when-property-is name="compiler.useSourceMaps" value="true"/>
  </replace-with>

</module>