Remove a bunch of provisionalDataSource() usage.

third_party/WebKit/Source/core/loader/EmptyClients.h

Index: third_party/WebKit/Source/core/loader/EmptyClients.h
diff --git a/third_party/WebKit/Source/core/loader/EmptyClients.h b/third_party/WebKit/Source/core/loader/EmptyClients.h
index 731829e7bdbadbcc668983a68091f45f35982dc6..7986340344e1bbb52368ffcde91def4fe9070873 100644
--- a/third_party/WebKit/Source/core/loader/EmptyClients.h
+++ b/third_party/WebKit/Source/core/loader/EmptyClients.h
@@ -196,12 +196,12 @@ public:
     void dispatchDidHandleOnloadEvents() override {}
     void dispatchDidReceiveServerRedirectForProvisionalLoad() override {}
     void dispatchWillClose() override {}
-    void dispatchDidStartProvisionalLoad(double triggeringEventTime) override {}
+    void dispatchDidStartProvisionalLoad(DocumentLoader*, double triggeringEventTime) override {}
     void dispatchDidReceiveTitle(const String&) override {}
     void dispatchDidChangeIcons(IconType) override {}
     void dispatchDidCommitLoad(HistoryItem*, HistoryCommitType) override {}
-    void dispatchDidFailProvisionalLoad(const ResourceError&, HistoryCommitType) override {}
-    void dispatchDidFailLoad(const ResourceError&, HistoryCommitType) override {}
+    void dispatchDidFailProvisionalLoad(DocumentLoader*, const ResourceError&, HistoryCommitType) override {}
+    void dispatchDidFailLoad(DocumentLoader*, const ResourceError&, HistoryCommitType) override {}
     void dispatchDidFinishDocumentLoad(bool) override {}
     void dispatchDidFinishLoad() override {}
     void dispatchDidChangeThemeColor() override {}
@@ -210,7 +210,7 @@ public:
     bool hasPendingNavigation() override;
 
     void dispatchWillSendSubmitEvent(HTMLFormElement*) override;
-    void dispatchWillSubmitForm(HTMLFormElement*) override;
+    void dispatchWillSubmitForm(DocumentLoader*, HTMLFormElement*) override {}
 
     void didStartLoading(LoadStartType) override {}
     void progressEstimateChanged(double) override {}