Fix the handling of user gestures for external protocol handler dialogs.

chrome/browser/autocomplete/autocomplete_input.cc

Index: chrome/browser/autocomplete/autocomplete_input.cc
diff --git a/chrome/browser/autocomplete/autocomplete_input.cc b/chrome/browser/autocomplete/autocomplete_input.cc
index ea4285172a6a3c21fd963991f877554d079d22ff..198c09226366597b3ebfe23915dad112f32055c2 100644
--- a/chrome/browser/autocomplete/autocomplete_input.cc
+++ b/chrome/browser/autocomplete/autocomplete_input.cc
@@ -198,9 +198,12 @@ AutocompleteInput::Type AutocompleteInput::Parse(
     // handlable schemes (e.g. "javascript") may be treated as "blocked" by the
     // external protocol handler because we don't want pages to open them, but
     // users still can.
+    // Note that the protocol handler needs to be informed that omnibox input
+    // should always be considered "user gesture-triggered", lest it always
+    // return BLOCK.
     ExternalProtocolHandler::BlockState block_state =
         ExternalProtocolHandler::GetBlockState(
-            base::UTF16ToUTF8(parsed_scheme));
+            base::UTF16ToUTF8(parsed_scheme), true);
     switch (block_state) {
       case ExternalProtocolHandler::DONT_BLOCK:
         return return_value_for_non_http_url;