Add deprecation messages for blocked subresource types.

third_party/WebKit/Source/core/frame/Deprecation.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/frame/Deprecation.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/frame/FrameConsole.h"
 #include "core/frame/FrameHost.h"
@@ skipping 245 matching lines @@
     case UseCounter::GetMatchedCSSRules:
       return "'getMatchedCSSRules()' is deprecated. For more help, check "
              "https://code.google.com/p/chromium/issues/detail?id=437569#c2";
 
     case UseCounter::PrefixedWindowURL:
       return replacedBy("'webkitURL'", "'URL'");
 
     case UseCounter::RangeExpand:
       return replacedBy("'Range.expand()'", "'Selection.modify()'");
 
+    // Blocked subresource requests:
+    case UseCounter::LegacyProtocolEmbeddedAsSubresource:
+      return String::format(
+          "Subresource requests using legacy protocols (like `ftp:`) are "
+          "deprecated, and will be blocked in %s. Please deliver "
+          "web-accessible resources over modern protocols like HTTPS. "
+          "See https://www.chromestatus.com/feature/5709390967472128 for more "
+          "details.",
+          milestoneString(M59));
+
+    case UseCounter::RequestedSubresourceWithEmbeddedCredentials:
+      return String::format(
+          "Subresource requests whose URLs contain embedded credentials (e.g. "
+          "`https://user:pass@host/`) are deprecated, and will be blocked in "
+          "%s. See https://www.chromestatus.com/feature/5669008342777856 for "
+          "more details.",
+          milestoneString(M59));
+
     // Powerful features on insecure origins (https://goo.gl/rStTGz)
     case UseCounter::DeviceMotionInsecureOrigin:
       return "The devicemotion event is deprecated on insecure origins, and "
              "support will be removed in the future. You should consider "
              "switching your application to a secure origin, such as HTTPS. "
              "See https://goo.gl/rStTGz for more details.";
 
     case UseCounter::DeviceOrientationInsecureOrigin:
       return "The deviceorientation event is deprecated on insecure origins, "
              "and support will be removed in the future. You should consider "
@@ skipping 131 matching lines @@
           "-internal-media-controls-text-track-list* selectors", M59,
           "5661431349379072");
 
     // Features that aren't deprecated don't have a deprecation message.
     default:
       return String();
   }
 }
 
 }  // namespace blink