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 3adda89eabdd025a9c645aec4e1d79d81fac0391..9f761c42040a9adf2436753a2aa07634c6b36f5b 100644
--- a/components/update_client/utils.h
+++ b/components/update_client/utils.h
@@ -10,10 +10,13 @@
 #include <utility>
 #include <vector>
 
+#include "base/callback_forward.h"
+#include "components/update_client/update_client.h"
 
 class GURL;
 
 namespace base {
+class DictionaryValue;
 class FilePath;
 }
 
@@ -114,6 +117,10 @@ bool IsValidInstallerAttribute(const InstallerAttribute& attr);
 // 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_