| Index: chrome/browser/metrics/desktop_session_duration/desktop_session_duration_observer.h
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| diff --git a/chrome/browser/metrics/desktop_session_duration/desktop_session_duration_observer.h b/chrome/browser/metrics/desktop_session_duration/desktop_session_duration_observer.h
 | 
| index a5b8c462abad05ac384ad02e13488d1068ffd570..58e77c5dec37d3662d16b869dbb42ffac26125ee 100644
 | 
| --- a/chrome/browser/metrics/desktop_session_duration/desktop_session_duration_observer.h
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| +++ b/chrome/browser/metrics/desktop_session_duration/desktop_session_duration_observer.h
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| @@ -39,6 +39,7 @@ class DesktopSessionDurationObserver
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|  
 | 
|    // content::RenderWidgetHost::InputEventObserver:
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|    void OnInputEvent(const blink::WebInputEvent& event) override;
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| +  void OnInputEventAck(const blink::WebInputEvent& event) override {};
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|  
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|    // content::WebContentsObserver:
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|    void RenderViewHostChanged(content::RenderViewHost* old_host,
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| 
 |