PlzNavigate: Move navigation-level mixed content checks to the browser.

content/browser/frame_host/navigation_handle_impl.cc

Index: content/browser/frame_host/navigation_handle_impl.cc
diff --git a/content/browser/frame_host/navigation_handle_impl.cc b/content/browser/frame_host/navigation_handle_impl.cc
index 30536bd306c76c4da490f9ea142210612c907d0c..9b185c7b2f2d09961e0128c2f519b7422a75ada8 100644
--- a/content/browser/frame_host/navigation_handle_impl.cc
+++ b/content/browser/frame_host/navigation_handle_impl.cc
@@ -16,6 +16,7 @@
 #include "content/browser/frame_host/ancestor_throttle.h"
 #include "content/browser/frame_host/debug_urls.h"
 #include "content/browser/frame_host/frame_tree_node.h"
+#include "content/browser/frame_host/mixed_content_navigation_throttle.h"
 #include "content/browser/frame_host/navigator.h"
 #include "content/browser/frame_host/navigator_delegate.h"
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
@@ -32,7 +33,6 @@
 #include "content/public/common/url_constants.h"
 #include "net/base/net_errors.h"
 #include "net/url_request/redirect_info.h"
-#include "third_party/WebKit/public/platform/WebMixedContentContextType.h"
 #include "url/gurl.h"
 #include "url/url_constants.h"
 
@@ -792,6 +792,12 @@ void NavigationHandleImpl::RegisterNavigationThrottles() {
   // RegisterThrottleForTesting.
   std::vector<std::unique_ptr<NavigationThrottle>> throttles_to_register =
       GetDelegate()->CreateThrottlesForNavigation(this);
+
+  std::unique_ptr<NavigationThrottle> mixed_content_throttle =
+      MixedContentNavigationThrottle::CreateThrottleForNavigation(this);
+  if (mixed_content_throttle)
+    throttles_to_register.push_back(std::move(mixed_content_throttle));
+
   std::unique_ptr<NavigationThrottle> devtools_throttle =
       RenderFrameDevToolsAgentHost::CreateThrottleForNavigation(this);
   if (devtools_throttle)