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 34608a6daaf4291f00cce463d3034ab5405ff613..1f540add83c2e5d17c7176d24357a4df3425a48f 100644
--- a/chrome/renderer/content_settings_observer.cc
+++ b/chrome/renderer/content_settings_observer.cc
@@ -406,6 +406,8 @@ 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) {
@@ -429,6 +431,8 @@ 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));
 }