EME: Add milestone to deprecation message for 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 e0da2dd66cc2eb892c915b8ee79f5ecfa6fa856f..fbe8725b4ae5a1679389fa4519dcbcfc330ff69a 100644
--- a/third_party/WebKit/Source/core/frame/Deprecation.cpp
+++ b/third_party/WebKit/Source/core/frame/Deprecation.cpp
@@ -369,7 +369,7 @@ String Deprecation::deprecationMessage(UseCounter::Feature feature)
         return replacedWillBeRemoved("'window.postMessage(message, transferables, targetOrigin)'", "'window.postMessage(message, targetOrigin, transferables)'", 54, "5719033043222528");
 
     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.";
+        return String::format("contentType strings without codecs will not be supported by requestMediaKeySystemAccess() in %s. Please specify the desired codec(s) as part of the contentType.", milestoneString(54));

[ddorwin, 2016/05/19 19:37:29]

Most other messages say "will be removed in," which is a little less ambiguous
than "will not be supported in" a specific version.

There are some other changes we might make to be more consistent. For example:
EME requires that contentType strings accepted by requestMediaKeySystemAccess()
include codecs. Non-standard support for contentType strings without codecs will
be removed in %s. Please specify the desired codec(s) as part of the
contentType.

[jrummell, 2016/05/19 19:52:21]

Done.

 
     case UseCounter::V8KeyboardEvent_KeyIdentifier_AttributeGetter:
         return willBeRemoved("'KeyboardEvent.keyIdentifier'", 53, "5316065118650368");