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

chrome/renderer/content_settings_observer.cc

Index: chrome/renderer/content_settings_observer.cc
diff --git a/chrome/renderer/content_settings_observer.cc b/chrome/renderer/content_settings_observer.cc
index 3a696956517d71405d91a2af216ebeda22e939fe..0d63cee2ffd2068f10e2737a41c2693cfe10857c 100644
--- a/chrome/renderer/content_settings_observer.cc
+++ b/chrome/renderer/content_settings_observer.cc
@@ -390,6 +390,8 @@ bool ContentSettingsObserver::allowRunningInsecureContent(
     bool allowed_per_settings,
     const blink::WebSecurityOrigin& origin,
     const blink::WebURL& resource_url) {
+  // Note: this implementation is a mirror of
+  // Browser::ShouldAllowRunningInsecureContent.
   FilteredReportInsecureContentRan(GURL(resource_url));
 
   if (!allow_running_insecure_content_ && !allowed_per_settings) {
@@ -413,6 +415,8 @@ bool ContentSettingsObserver::allowAutoplay(bool default_value) {
 
 void ContentSettingsObserver::passiveInsecureContentFound(
     const blink::WebURL& resource_url) {
+  // Note: this implementation is a mirror of
+  // Browser::PassiveInsecureContentFound.
   ReportInsecureContent(SslInsecureContentType::DISPLAY);
   FilteredReportInsecureContentDisplayed(GURL(resource_url));
 }