Block mixed content fonts.

Source/core/fetch/ResourceFetcher.cpp

Index: Source/core/fetch/ResourceFetcher.cpp
diff --git a/Source/core/fetch/ResourceFetcher.cpp b/Source/core/fetch/ResourceFetcher.cpp
index 3d9e42a7b080a4bf1a3c2c498d9627995055ba1e..3e810e026a71f20d39532059b7df3ad7c9867fc2 100644
--- a/Source/core/fetch/ResourceFetcher.cpp
+++ b/Source/core/fetch/ResourceFetcher.cpp
@@ -422,10 +422,15 @@ bool ResourceFetcher::checkInsecureContent(Resource::Type type, const KURL& url,
             treatment = TreatAsActiveContent;
             break;
 
+        case Resource::Font:
+            // These resources are passive, but mixed usage is low enough that we
+            // can block them in a mixed context.
+            treatment = TreatAsActiveContent;
+            break;
+
         case Resource::TextTrack:
         case Resource::Raw:
         case Resource::Image:
-        case Resource::Font:
         case Resource::Media:
             // These resources can corrupt only the frame's pixels.
             treatment = TreatAsPassiveContent;