Forward declare ShellClient for MojoApplicationInfo

content/public/common/mojo_application_info.h

Index: content/public/common/mojo_application_info.h
diff --git a/content/public/common/mojo_application_info.h b/content/public/common/mojo_application_info.h
index b5bcc4477c6ad6d8a79b4e86e96151a320924938..f412aa6dbc08472f57ec2f030850ff0534a39f7d 100644
--- a/content/public/common/mojo_application_info.h
+++ b/content/public/common/mojo_application_info.h
@@ -7,14 +7,14 @@
 
 #include <memory>
 
-#include "base/callback_forward.h"
+#include "base/callback.h"
 #include "base/memory/ref_counted.h"
+#include "base/single_thread_task_runner.h"
 #include "content/common/content_export.h"
-#include "services/shell/public/cpp/shell_client.h"
 
-namespace base {
-class SingleThreadTaskRunner;
-}  // namespace base
+namespace shell {
+class ShellClient;
+}
 
 namespace content {