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 eba07da522c327c1ceb5d2da68d6918584214342..c1f7501fae65b5f61f28a376e395656674f1db81 100644
--- a/content/browser/frame_host/navigation_handle_impl.cc
+++ b/content/browser/frame_host/navigation_handle_impl.cc
@@ -14,6 +14,7 @@
 #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"
@@ -92,6 +93,8 @@ NavigationHandleImpl::NavigationHandleImpl(
       navigation_start_(navigation_start),
       pending_nav_entry_id_(pending_nav_entry_id),
       request_context_type_(REQUEST_CONTEXT_TYPE_UNSPECIFIED),
+      mixed_content_context_type_(
+          blink::WebMixedContent::ContextType::Blockable),
       should_replace_current_entry_(false),
       is_download_(false),
       is_stream_(false),
@@ -315,6 +318,7 @@ NavigationHandleImpl::CallWillStartRequestForTesting(
   WillStartRequest(method, resource_request_body, sanitized_referrer,
                    has_user_gesture, transition, is_external_protocol,
                    REQUEST_CONTEXT_TYPE_LOCATION,
+                   blink::WebMixedContent::ContextType::Blockable,
                    base::Bind(&UpdateThrottleCheckResult, &result));
 
   // Reset the callback to ensure it will not be called later.
@@ -422,6 +426,7 @@ void NavigationHandleImpl::WillStartRequest(
     ui::PageTransition transition,
     bool is_external_protocol,
     RequestContextType request_context_type,
+    blink::WebMixedContent::ContextType mixed_content_context_type,
     const ThrottleChecksFinishedCallback& callback) {
   if (method != "POST")
     DCHECK(!resource_request_body);
@@ -435,6 +440,7 @@ void NavigationHandleImpl::WillStartRequest(
   transition_ = transition;
   is_external_protocol_ = is_external_protocol;
   request_context_type_ = request_context_type;
+  mixed_content_context_type_ = mixed_content_context_type;
   state_ = WILL_SEND_REQUEST;
   complete_callback_ = callback;
 
@@ -783,6 +789,10 @@ void NavigationHandleImpl::RegisterNavigationThrottles() {
   // GetNavigationThrottles is not assigned to throttles_ directly because it
   // would overwrite any throttle previously added with
   // RegisterThrottleForTesting.
+  if (IsBrowserSideNavigationEnabled()) {
+    throttles_.insert(throttles_.end(),
+                      new MixedContentNavigationThrottle(this));
+  }
   ScopedVector<NavigationThrottle> throttles_to_register =
       GetDelegate()->CreateThrottlesForNavigation(this);
   std::unique_ptr<NavigationThrottle> devtools_throttle =