Cleanup: Use http/https constants in components.

components/autofill/core/browser/autofill_manager.cc

Index: components/autofill/core/browser/autofill_manager.cc
diff --git a/components/autofill/core/browser/autofill_manager.cc b/components/autofill/core/browser/autofill_manager.cc
index 8ce3a2948dfe570068b273210dd3e88583c3f34e..63093c974a547ce2c001505a0fc7df6c136dca88 100644
--- a/components/autofill/core/browser/autofill_manager.cc
+++ b/components/autofill/core/browser/autofill_manager.cc
@@ -117,9 +117,7 @@ bool SectionIsAutofilled(const FormStructure& form_structure,
 }
 
 bool FormIsHTTPS(const FormStructure& form) {
-  // TODO(blundell): Change this to use a constant once crbug.com/306258 is
-  // fixed.
-  return form.source_url().SchemeIs("https");
+  return form.source_url().SchemeIs(url::kHttpsScheme);
 }
 
 // Uses the existing personal data in |profiles| and |credit_cards| to determine