Revert of Makes the component installers return a Result instead of a bool.

components/update_client/utils.h

Index: components/update_client/utils.h
diff --git a/components/update_client/utils.h b/components/update_client/utils.h
index 9f761c42040a9adf2436753a2aa07634c6b36f5b..3adda89eabdd025a9c645aec4e1d79d81fac0391 100644
--- a/components/update_client/utils.h
+++ b/components/update_client/utils.h
@@ -10,13 +10,10 @@
 #include <utility>
 #include <vector>
 
-#include "base/callback_forward.h"
-#include "components/update_client/update_client.h"
 
 class GURL;
 
 namespace base {
-class DictionaryValue;
 class FilePath;
 }
 
@@ -117,10 +114,6 @@
 // Removes the unsecure urls in the |urls| parameter.
 void RemoveUnsecureUrls(std::vector<GURL>* urls);
 
-// Adapter function for the old definitions of CrxInstaller::Install until the
-// component installer code is migrated to use a REsult instead of bool.
-CrxInstaller::Result InstallFunctionWrapper(base::Callback<bool()> callback);
-
 }  // namespace update_client
 
 #endif  // COMPONENTS_UPDATE_CLIENT_UTILS_H_