Clears out external protocol data when cookies and site data is cleared.

chrome/browser/browsing_data/browsing_data_remover.h

Index: chrome/browser/browsing_data/browsing_data_remover.h
diff --git a/chrome/browser/browsing_data/browsing_data_remover.h b/chrome/browser/browsing_data/browsing_data_remover.h
index b291f4668811f41ac70083d27b93fb7d3466c16f..335844db3a6a8095e331224a777b6b2953969082 100644
--- a/chrome/browser/browsing_data/browsing_data_remover.h
+++ b/chrome/browser/browsing_data/browsing_data_remover.h
@@ -80,6 +80,7 @@ class BrowsingDataRemover {
     REMOVE_WEBAPP_DATA = 1 << 18,
 #endif
     REMOVE_DURABLE_PERMISSION = 1 << 19,
+    REMOVE_EXTERNAL_PROTOCOL_DATA = 1 << 20,
 
     // The following flag is used only in tests. In normal usage, hosted app
     // data is controlled by the REMOVE_COOKIES flag, applied to the
@@ -101,7 +102,8 @@ class BrowsingDataRemover {
                        REMOVE_WEBAPP_DATA |
 #endif
                        REMOVE_SITE_USAGE_DATA |
-                       REMOVE_DURABLE_PERMISSION,
+                       REMOVE_DURABLE_PERMISSION |
+                       REMOVE_EXTERNAL_PROTOCOL_DATA,
 
     // Datatypes protected by Important Sites.
     IMPORTANT_SITES_DATATYPES = REMOVE_SITE_DATA | REMOVE_CACHE,