Extensions: remove DeprecatedDisableReason

extensions/common/extension.h

Index: extensions/common/extension.h
diff --git a/extensions/common/extension.h b/extensions/common/extension.h
index 2363841a572b49d7c41d1115889e2fa99e407a3d..82263920d799b6cf08dcd027cdce09ae8a97c251 100644
--- a/extensions/common/extension.h
+++ b/extensions/common/extension.h
@@ -73,15 +73,6 @@ class Extension : public base::RefCountedThreadSafe<Extension> {
     NUM_STATES
   };
 
-  // Used to record the reason an extension was disabled.
-  enum DeprecatedDisableReason {
-    DEPRECATED_DISABLE_UNKNOWN,
-    DEPRECATED_DISABLE_USER_ACTION,
-    DEPRECATED_DISABLE_PERMISSIONS_INCREASE,
-    DEPRECATED_DISABLE_RELOAD,
-    DEPRECATED_DISABLE_LAST,  // Not used.
-  };
-
   // Reasons an extension may be disabled. These are used in histograms, so do
   // not remove/reorder entries - only add at the end just before
   // DISABLE_REASON_LAST (and update the shift value for it). Also remember to