Small followup to r519351 to make ClientSideDetectionHost ignore same-document navigations.

Bug: 783981
Change-Id: I41afc98d8c9d60051cde53f3d17c28515ec9a8aa
Reviewed-on: https://chromium-review.googlesource.com/807403Reviewed-by: Jialiu Lin <jialiul@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521589}

chrome/browser/safe_browsing/client_side_detection_host.cc

@@ -375,7 +375,8 @@ bool ClientSideDetectionHost::OnMessageReceived(
 void ClientSideDetectionHost::DidFinishNavigation(
     content::NavigationHandle* navigation_handle) {
   if (browse_info_.get() && should_extract_malware_features_ &&
-      navigation_handle->HasCommitted() && !navigation_handle->IsDownload()) {
+      navigation_handle->HasCommitted() && !navigation_handle->IsDownload() &&
+      !navigation_handle->IsSameDocument()) {
     content::ResourceType resource_type =
         navigation_handle->IsInMainFrame() ? content::RESOURCE_TYPE_MAIN_FRAME
                                            : content::RESOURCE_TYPE_SUB_FRAME;