Revert of Migrate external protocol prefs from local state to profiles

chrome/browser/prerender/prerender_test_utils.cc

Index: chrome/browser/prerender/prerender_test_utils.cc
diff --git a/chrome/browser/prerender/prerender_test_utils.cc b/chrome/browser/prerender/prerender_test_utils.cc
index 73a22726df91fa18c65967ea7ea4fc3d5396ddfe..0a844c8e42e8c7693ecb5c31cdb9e542e3e32fd1 100644
--- a/chrome/browser/prerender/prerender_test_utils.cc
+++ b/chrome/browser/prerender/prerender_test_utils.cc
@@ -224,8 +224,8 @@
     return nullptr;
   }
 
-  ExternalProtocolHandler::BlockState GetBlockState(const std::string& scheme,
-                                                    Profile* profile) override {
+  ExternalProtocolHandler::BlockState GetBlockState(
+      const std::string& scheme) override {
     // Block everything and fail the test.
     ADD_FAILURE();
     return ExternalProtocolHandler::BLOCK;