Fix LoadDataWithBaseUrlTest#testloadDataWithBaseUrlCallsOnPageStarted with PlzNavigate.

content/public/browser/navigation_handle.h

Index: content/public/browser/navigation_handle.h
diff --git a/content/public/browser/navigation_handle.h b/content/public/browser/navigation_handle.h
index 4795ef21aec2b144a9cb0e0e13ff63a2574c8f76..b81bb398ff2d943f935716d3cf10ac430cc1a44a 100644
--- a/content/public/browser/navigation_handle.h
+++ b/content/public/browser/navigation_handle.h
@@ -110,6 +110,9 @@ class CONTENT_EXPORT NavigationHandle {
   // if the navigation is not a restore.
   virtual RestoreType GetRestoreType() = 0;
 
+  // Used for specifying a base URL for pages loaded via data URLs.
+  virtual const GURL& GetBaseURLForDataURL() = 0;
+
   // Parameters available at network request start time ------------------------
   //
   // The following parameters are only available when the network request is