CONTENT_EXPORT is missing for ContentMainRunner class

content/public/app/content_main_runner.h

Index: content/public/app/content_main_runner.h
diff --git a/content/public/app/content_main_runner.h b/content/public/app/content_main_runner.h
index a3c78085db779bf3a237603c0d1c3bf39bd68082..5fec99790b540f556f20861bbc3178fece2ce988 100644
--- a/content/public/app/content_main_runner.h
+++ b/content/public/app/content_main_runner.h
@@ -5,11 +5,14 @@
 #ifndef CONTENT_PUBLIC_APP_CONTENT_MAIN_RUNNER_H_
 #define CONTENT_PUBLIC_APP_CONTENT_MAIN_RUNNER_H_
 
+#include "build/build_config.h"
+#include "content/common/content_export.h"
+
 namespace content {
 struct ContentMainParams;
 
 // This class is responsible for content initialization, running and shutdown.
-class ContentMainRunner {
+class CONTENT_EXPORT ContentMainRunner {
  public:
   virtual ~ContentMainRunner() {}