DevTools: Add support for //# sourceURL (sourceMappingURL) comments and deprecate //@ ones

LayoutTests/inspector/styles/stylesheet-source-url-comment.html

Index: LayoutTests/inspector/styles/stylesheet-source-url-comment.html
diff --git a/LayoutTests/inspector/styles/stylesheet-source-url-comment.html b/LayoutTests/inspector/styles/stylesheet-source-url-comment.html
index 902242572e1176ba34c2a3e938590f936d1d47a5..e114bc7927faba22cc97277a5a725e0d340b664e 100644
--- a/LayoutTests/inspector/styles/stylesheet-source-url-comment.html
+++ b/LayoutTests/inspector/styles/stylesheet-source-url-comment.html
@@ -7,20 +7,20 @@ body {
     color: green;
 }
 
-/*@ sourceURL=inlineStyleSheet.css */
+/*# sourceURL=inlineStyleSheet.css */
 </style>
 <script>
 function addInlineStyleSheet()
 {
     var styleElement = document.createElement("style");
-    styleElement.textContent = "body { color: black; }\n/*@ sourceURL=css/addedInlineStylesheet.css */";
+    styleElement.textContent = "body { color: black; }\n/*# sourceURL=css/addedInlineStylesheet.css */";
     document.head.appendChild(styleElement);
 }
 
 function addInlineStyleSheetNonRelative()
 {
     var styleElement = document.createElement("style");
-    styleElement.textContent = "body { color: red; }\n/*@ sourceURL=/css/nonRelativeInlineStylesheet.css */";
+    styleElement.textContent = "body { color: red; }\n/*# sourceURL=/css/nonRelativeInlineStylesheet.css */";
     document.head.appendChild(styleElement);
 }