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 de57921904d0b983a2cd5c1b5d662b108af3cb61..710def11e46ca93521122a7e63be18332fd5f317 100644
--- a/chrome/renderer/content_settings_observer.cc
+++ b/chrome/renderer/content_settings_observer.cc
@@ -389,6 +389,8 @@ 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) {
@@ -412,6 +414,8 @@ 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));
 }