Remove the ability to set the default search engine from JS.

chrome/renderer/external_extension_uitest.cc

Index: chrome/renderer/external_extension_uitest.cc
diff --git a/chrome/renderer/external_extension_uitest.cc b/chrome/renderer/external_extension_uitest.cc
index d5afe82c7a45fbf2c644bebe6169690c68b52027..ade757e2c52c8fec4dbcc840e4d718a14b36b51d 100644
--- a/chrome/renderer/external_extension_uitest.cc
+++ b/chrome/renderer/external_extension_uitest.cc
@@ -45,9 +45,6 @@ SearchProviderTest::SearchProviderTest()
   if (!test_server_started_)
     return;
 
-  // Enable the search provider additions.
-  launch_arguments_.AppendSwitch(switches::kEnableSearchProviderApiV2);
-
   // Map all hosts to our local server.
   std::string host_rule("MAP * " + test_server_.host_port_pair().ToString());
   launch_arguments_.AppendSwitchASCII(switches::kHostRules, host_rule);