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 0c98a21b0dbeee2400d5832d7ae82c6826f87f1d..bda8c967df3de912d6885f9a4e2f82fc024dbb60 100644
--- a/chrome/renderer/content_settings_observer.cc
+++ b/chrome/renderer/content_settings_observer.cc
@@ -399,6 +399,8 @@ bool ContentSettingsObserver::allowMutationEvents(bool default_value) {
 bool ContentSettingsObserver::allowDisplayingInsecureContent(
     bool allowed_per_settings,
     const blink::WebURL& resource_url) {
+  // Note: this implementation is a mirror of
+  // ChromeContentBrowserClient::ShouldAllowDisplayingInsecureContent
   ReportInsecureContent(SslInsecureContentType::DISPLAY);
   FilteredReportInsecureContentDisplayed(GURL(resource_url));
 
@@ -414,6 +416,8 @@ bool ContentSettingsObserver::allowRunningInsecureContent(
     bool allowed_per_settings,
     const blink::WebSecurityOrigin& origin,
     const blink::WebURL& resource_url) {
+  // Note: this implementation is a mirror of
+  // ChromeContentBrowserClient::ShouldAllowRunningInsecureContent
   FilteredReportInsecureContentRan(GURL(resource_url));
 
   if (!allow_running_insecure_content_ && !allowed_per_settings) {