Allow fallback from https to http for component update checks.

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 bd428cafabdd441453c84334c7597c4c56d196d4..af353f76d67634f33c7aac80d9d7c0bf357c574d 100644
--- a/components/update_client/utils.h
+++ b/components/update_client/utils.h
@@ -6,6 +6,7 @@
 #define COMPONENTS_UPDATE_CLIENT_UTILS_H_
 
 #include <string>
+#include <vector>
 
 #include "base/memory/scoped_ptr.h"
 
@@ -98,6 +99,9 @@ bool VerifyFileHash256(const base::FilePath& filepath,
 // Returns true if the |brand| parameter matches ^([a-zA-Z]{4})?$ .
 bool IsValidBrand(const std::string& brand);
 
+// Removes the unsecure urls in the |urls| parameter.
+void RemoveUnsecureUrls(std::vector<GURL>* urls);
+
 }  // namespace update_client
 
 #endif  // COMPONENTS_UPDATE_CLIENT_UTILS_H_