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 d7dcbefabbf2f06121040f756c61a2c45587d524..54b794aae06a331e5c213c20dbabf12c015539a2 100644
--- a/content/browser/frame_host/navigation_handle_impl.cc
+++ b/content/browser/frame_host/navigation_handle_impl.cc
@@ -8,6 +8,7 @@
 
 #include "base/logging.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/service_worker/service_worker_context_wrapper.h"
@@ -269,6 +270,7 @@ NavigationHandleImpl::CallWillStartRequestForTesting(
 
   WillStartRequest(method, resource_request_body, sanitized_referrer,
                    has_user_gesture, transition, is_external_protocol,
+                   REQUEST_CONTEXT_TYPE_LOCATION,
                    base::Bind(&UpdateThrottleCheckResult, &result));
 
   // Reset the callback to ensure it will not be called later.
@@ -304,6 +306,7 @@ void NavigationHandleImpl::WillStartRequest(
     bool has_user_gesture,
     ui::PageTransition transition,
     bool is_external_protocol,
+    RequestContextType fetch_request_context_type,
     const ThrottleChecksFinishedCallback& callback) {
   // |method != "POST"| should imply absence of |resource_request_body|.
   if (method != "POST" && resource_request_body) {
@@ -319,10 +322,12 @@ void NavigationHandleImpl::WillStartRequest(
   has_user_gesture_ = has_user_gesture;
   transition_ = transition;
   is_external_protocol_ = is_external_protocol;
-
+  fetch_request_context_type_ = fetch_request_context_type;
   state_ = WILL_SEND_REQUEST;
   complete_callback_ = callback;
 
+  throttles_.insert(throttles_.end(), new MixedContentNavigationThrottle(this));
+
   // Register the navigation throttles. The ScopedVector returned by
   // GetNavigationThrottles is not assigned to throttles_ directly because it
   // would overwrite any throttle previously added with