EME: Correctly handle container-only contentType strings

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

Index: third_party/WebKit/Source/core/frame/Deprecation.cpp
diff --git a/third_party/WebKit/Source/core/frame/Deprecation.cpp b/third_party/WebKit/Source/core/frame/Deprecation.cpp
index 2f9514b77d54f65414fcfaff0ce395b375d33d93..24a04bada069a41e02357cfe4c635b4a01bfe975 100644
--- a/third_party/WebKit/Source/core/frame/Deprecation.cpp
+++ b/third_party/WebKit/Source/core/frame/Deprecation.cpp
@@ -364,6 +364,9 @@ String Deprecation::deprecationMessage(UseCounter::Feature feature)
     case UseCounter::WebAnimationsEasingAsFunctionLinear:
         return String::format("Specifying animation easing as a function is deprecated and all support will be removed in %s, at which point this will throw a TypeError. This warning may have been triggered by the Web Animations or Polymer polyfills. See http://crbug.com/601672 for details.", milestoneString(54));
 
+    case UseCounter::EncryptedMediaAllSelectedContentTypesMissingCodecs:
+        return "contentType strings without codecs will not be supported by requestMediaKeySystemAccess() in the future. Please specify the desired codec(s) as part of the contentType.";
+
     // Features that aren't deprecated don't have a deprecation message.
     default:
         return String();