prune down content_dll change to just the CONTENT_EXPORTS

content/common/hi_res_timer_manager.h

Index: content/common/hi_res_timer_manager.h
diff --git a/content/common/hi_res_timer_manager.h b/content/common/hi_res_timer_manager.h
index 5c3ae380edf4b0a7d1e61ed61d5c0bdf1151981c..ff2ff1f081282e7bf47804b874dae5f7d2602e25 100644
--- a/content/common/hi_res_timer_manager.h
+++ b/content/common/hi_res_timer_manager.h
@@ -7,10 +7,12 @@
 #pragma once
 
 #include "base/system_monitor/system_monitor.h"
+#include "content/common/content_export.h"
 
 // Ensures that the Windows high resolution timer is only used
 // when not running on battery power.
-class HighResolutionTimerManager : public base::SystemMonitor::PowerObserver {
+class CONTENT_EXPORT HighResolutionTimerManager
+    : public base::SystemMonitor::PowerObserver {
  public:
   HighResolutionTimerManager();
   virtual ~HighResolutionTimerManager();