Fix memory leak in TestRenderFrameHost::SimulateCommitProcessed.

Bug: 784904
Change-Id: I29399a9fd75e023b0289216e51eee8033e65d24c
Reviewed-on: https://chromium-review.googlesource.com/c/1454492Reviewed-by: Camille Lamy <clamy@chromium.org>
Commit-Queue: Marek Haranczyk <mharanczyk@opera.com>
Cr-Commit-Position: refs/heads/master@{#629559}

content/test/test_render_frame_host.cc

@@ -480,7 +480,7 @@ void TestRenderFrameHost::SimulateCommitProcessed(
 
   if (!did_commit) {
     SendNavigateWithParamsAndInterfaceParams(
-        params.release(),
+        params.get(),
         mojom::DidCommitProvisionalLoadInterfaceParams::New(
             std::move(interface_provider_request),
             std::move(document_interface_broker_content_request),