Update UseCounter::deprecationMessage() cases to use the replacedBy function

Source/core/frame/UseCounter.cpp

Index: Source/core/frame/UseCounter.cpp
diff --git a/Source/core/frame/UseCounter.cpp b/Source/core/frame/UseCounter.cpp
index 5fbb2a824762479f2a3e6b66c023bc3986eb78d5..f6a54e61ef788c0f45adf123a81303261ffa2a73 100644
--- a/Source/core/frame/UseCounter.cpp
+++ b/Source/core/frame/UseCounter.cpp
@@ -665,10 +665,20 @@ void UseCounter::countDeprecationIfNotPrivateScript(v8::Isolate* isolate, Execut
     UseCounter::countDeprecation(context, feature);
 }
 
-// FIXME: Update other UseCounter::deprecationMessage() cases to use this.
-static String replacedBy(const char* oldString, const char* newString)
+template <typename... T>

[Julien - ping for review, 2014/12/12 00:33:29]

Variadic template is allowed but seems to be troubled territory
(https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/6ItymeMXpMc).

My understanding is that this would also allow for 0 |replacementItems| which is
not great.

+static String replacedBy(const char* deprecatedItem, T... replacementItems)
 {
-    return String::format("'%s' is deprecated. Please use '%s' instead.", oldString, newString);
+    String replacementMessage;

[Julien - ping for review, 2014/12/12 17:27:46]

Probably better to use a StringBuilder even if the number of strings is small.

+    int itemsCount = 0;
+
+    for (const char* replacementItem : { replacementItems... }) {

[Nico, 2014/12/12 03:57:49]

I think iterating over an initializer list requires `#include
<initializer_list>`, which is a c++11 library thing, and c++11 library things
don't work on all platforms yet. So I'd expect that this won't compile on all
platforms.

[Julien - ping for review, 2014/12/12 17:27:46]

Thanks Nico, it seems like we should just stick with a simple char* array then.

+        if (itemsCount)
+            replacementMessage.append(" or ");
+        replacementMessage.append(String::format("%s", replacementItem));
+        itemsCount++;
+    }
+
+    return String::format("%s is deprecated. Please use %s instead.", deprecatedItem, replacementMessage.stripWhiteSpace().utf8().data());
 }
 
 String UseCounter::deprecationMessage(Feature feature)
@@ -676,20 +686,20 @@ String UseCounter::deprecationMessage(Feature feature)
     switch (feature) {
     // Quota
     case PrefixedStorageInfo:
-        return "'window.webkitStorageInfo' is deprecated. Please use 'navigator.webkitTemporaryStorage' or 'navigator.webkitPersistentStorage' instead.";
+        return replacedBy("window.webkitStorageInfo", "navigator.webkitTemporaryStorage", "navigator.webkitPersistentStorage");
 
     // Keyboard Event (DOM Level 3)
     case KeyboardEventKeyLocation:
         return replacedBy("KeyboardEvent.keyLocation", "KeyboardEvent.location");
 
     case ConsoleMarkTimeline:
-        return "console.markTimeline is deprecated. Please use the console.timeStamp instead.";
+        return replacedBy("console.markTimeline", "console.timeStamp");
 
     case FileError:
         return "FileError is deprecated. Please use the 'name' or 'message' attributes of DOMError rather than 'code'.";
 
     case ShowModalDialog:
-        return "showModalDialog is deprecated. Please use window.open and postMessage instead.";
+        return replacedBy("showModalDialog", "window.open", "postMessage");
 
     case CSSStyleSheetInsertRuleOptionalArg:
         return "Calling CSSStyleSheet.insertRule() with one argument is deprecated. Please pass the index argument as well: insertRule(x, 0).";
@@ -698,19 +708,19 @@ String UseCounter::deprecationMessage(Feature feature)
         return "'HTMLVideoElement.webkitSupportsFullscreen' is deprecated. Its value is true if the video is loaded.";
 
     case PrefixedVideoDisplayingFullscreen:
-        return "'HTMLVideoElement.webkitDisplayingFullscreen' is deprecated. Please use the 'fullscreenchange' and 'webkitfullscreenchange' events instead.";
+        return replacedBy("HTMLVideoElement.webkitDisplayingFullscreen", "fullscreenchange", "webkitfullscreenchange");
 
     case PrefixedVideoEnterFullscreen:
-        return "'HTMLVideoElement.webkitEnterFullscreen()' is deprecated. Please use 'Element.requestFullscreen()' and 'Element.webkitRequestFullscreen()' instead.";
+        return replacedBy("HTMLVideoElement.webkitEnterFullscreen()", "Element.requestFullscreen()", "Element.webkitRequestFullscreen()");
 
     case PrefixedVideoExitFullscreen:
-        return "'HTMLVideoElement.webkitExitFullscreen()' is deprecated. Please use 'Document.exitFullscreen()' and 'Document.webkitExitFullscreen()' instead.";
+        return replacedBy("HTMLVideoElement.webkitExitFullscreen()", "Document.exitFullscreen()", "Document.webkitExitFullscreen()");
 
     case PrefixedVideoEnterFullScreen:
-        return "'HTMLVideoElement.webkitEnterFullScreen()' is deprecated. Please use 'Element.requestFullscreen()' and 'Element.webkitRequestFullscreen()' instead.";
+        return replacedBy("HTMLVideoElement.webkitEnterFullScreen()", "Element.requestFullscreen()", "Element.webkitRequestFullscreen()");
 
     case PrefixedVideoExitFullScreen:
-        return "'HTMLVideoElement.webkitExitFullScreen()' is deprecated. Please use 'Document.exitFullscreen()' and 'Document.webkitExitFullscreen()' instead.";
+        return replacedBy("HTMLVideoElement.webkitExitFullScreen()", "Document.exitFullscreen()", "Document.webkitExitFullscreen()");
 
     case PrefixedGamepad:
         return replacedBy("navigator.webkitGetGamepads", "navigator.getGamepads");
@@ -764,31 +774,31 @@ String UseCounter::deprecationMessage(Feature feature)
         return "Setting 'XMLHttpRequest.withCredentials' for synchronous requests is deprecated.";
 
     case EventSourceURL:
-        return "'EventSource.URL' is deprecated. Please use 'EventSource.url' instead.";
+        return replacedBy("EventSource.URL", "EventSource.url");
 
     case WebSocketURL:
-        return "'WebSocket.URL' is deprecated. Please use 'WebSocket.url' instead.";
+        return replacedBy("WebSocket.URL", "WebSocket.url");
 
     case HTMLTableElementVspace:
-        return "The 'vspace' attribute on table is deprecated. Please use CSS instead.";
+        return replacedBy("'vspace' attribute on table", "CSS margin property");
 
     case HTMLTableElementHspace:
-        return "The 'hspace' attribute on table is deprecated. Please use CSS instead.";
+        return replacedBy("'hspace' attribute on table", "CSS margin property");
 
     case PictureSourceSrc:
         return "<source src> with a <picture> parent is invalid and therefore ignored. Please use <source srcset> instead.";
 
     case XHRProgressEventPosition:
-        return "The XMLHttpRequest progress event property 'position' is deprecated. Please use 'loaded' instead.";
+        return replacedBy("The XMLHttpRequest progress event property position", "loaded");
 
     case XHRProgressEventTotalSize:
-        return "The XMLHttpRequest progress event property 'totalSize' is deprecated. Please use 'total' instead.";
+        return replacedBy("The XMLHttpRequest progress event property totalSize", "total");
 
     case ConsoleTimeline:
-        return "console.timeline is deprecated. Please use the console.time instead.";
+        return replacedBy("console.timeline", "console.time");
 
     case ConsoleTimelineEnd:
-        return "console.timelineEnd is deprecated. Please use the console.timeEnd instead.";
+        return replacedBy("console.timelineEnd", "console.timeEnd");
 
     case XMLHttpRequestSynchronousInNonWorkerOutsideBeforeUnload:
         return "Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check http://xhr.spec.whatwg.org/.";