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 68841b8f69ebbbcf7e61fcde9cf2333562b442f0..af8e09ed433e94793eb371b79ce30424c3a2e5a5 100644
--- a/chrome/browser/prerender/prerender_browsertest.cc
+++ b/chrome/browser/prerender/prerender_browsertest.cc
@@ -972,8 +972,7 @@
     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;