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

chrome/browser/prerender/prerender_browsertest.cc

Index: chrome/browser/prerender/prerender_browsertest.cc
diff --git a/chrome/browser/prerender/prerender_browsertest.cc b/chrome/browser/prerender/prerender_browsertest.cc
index a713047038629b409ecccf080134bfce9c4591dc..517ae76aac3c3bd038baa641340f63bac33e85fe 100644
--- a/chrome/browser/prerender/prerender_browsertest.cc
+++ b/chrome/browser/prerender/prerender_browsertest.cc
@@ -984,8 +984,7 @@ class NeverRunsExternalProtocolHandlerDelegate
     return NULL;
   }
   virtual ExternalProtocolHandler::BlockState GetBlockState(
-      const std::string& scheme,
-      bool initiated_by_user_gesture) OVERRIDE {
+      const std::string& scheme) OVERRIDE {
     // Block everything and fail the test.
     ADD_FAILURE();
     return ExternalProtocolHandler::BLOCK;