PlzNavigate: Invoke didStartProvisionalLoad() when the renderer initiates a navigation in startLoad(

third_party/WebKit/Source/web/tests/WebFrameTest.cpp

Index: third_party/WebKit/Source/web/tests/WebFrameTest.cpp
diff --git a/third_party/WebKit/Source/web/tests/WebFrameTest.cpp b/third_party/WebKit/Source/web/tests/WebFrameTest.cpp
index d123a03ceffb17247de312433aaba890b5e7b4b9..01fbc965295783d5ee4339490a8ff18c30cb30cc 100644
--- a/third_party/WebKit/Source/web/tests/WebFrameTest.cpp
+++ b/third_party/WebKit/Source/web/tests/WebFrameTest.cpp
@@ -7351,9 +7351,9 @@ class TestHistoryWebFrameClient : public FrameTestHelpers::TestWebFrameClient {
     m_frame = nullptr;
   }
 
-  void didStartProvisionalLoad(WebLocalFrame* frame) {
-    WebDataSource* ds = frame->provisionalDataSource();
-    m_replacesCurrentHistoryItem = ds->replacesCurrentHistoryItem();
+  void didStartProvisionalLoad(WebLocalFrame* frame,
+                               WebDataSource* dataSource) {
+    m_replacesCurrentHistoryItem = dataSource->replacesCurrentHistoryItem();
     m_frame = frame;
   }
 
@@ -10083,7 +10083,7 @@ class CallbackOrderingWebFrameClient
     EXPECT_EQ(0, m_callbackCount++);
     FrameTestHelpers::TestWebFrameClient::didStartLoading(toDifferentDocument);
   }
-  void didStartProvisionalLoad(WebLocalFrame*) override {
+  void didStartProvisionalLoad(WebLocalFrame*, WebDataSource*) override {
     EXPECT_EQ(1, m_callbackCount++);
   }
   void didCommitProvisionalLoad(WebLocalFrame*,