PlzNavigate: inform the renderer that a navigation is a POST

content/test/test_render_frame_host.cc

Index: content/test/test_render_frame_host.cc
diff --git a/content/test/test_render_frame_host.cc b/content/test/test_render_frame_host.cc
index 6c486045cfeee96b13729c86fbe1f01db84e7997..793d940cd8d4848260df7f717a8e7cd6cedb0bf0 100644
--- a/content/test/test_render_frame_host.cc
+++ b/content/test/test_render_frame_host.cc
@@ -343,7 +343,7 @@ void TestRenderFrameHost::SendRendererInitiatedNavigationRequest(
   InitializeRenderFrameIfNeeded();
 
   if (IsBrowserSideNavigationEnabled()) {
-    BeginNavigationParams begin_params("GET", std::string(), net::LOAD_NORMAL,
+    BeginNavigationParams begin_params(std::string(), net::LOAD_NORMAL,
                                        has_user_gesture, false,
                                        REQUEST_CONTEXT_TYPE_HYPERLINK);
     CommonNavigationParams common_params;