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

LayoutTests/inspector/debugger/source-url-comment-expected.txt

Index: LayoutTests/inspector/debugger/source-url-comment-expected.txt
diff --git a/LayoutTests/inspector/debugger/source-url-comment-expected.txt b/LayoutTests/inspector/debugger/source-url-comment-expected.txt
index 7f83a7fa0583a36319c2599159dfb7450a7aa516..7006e3d401233d94c6c832f2efa095b68f500576 100644
--- a/LayoutTests/inspector/debugger/source-url-comment-expected.txt
+++ b/LayoutTests/inspector/debugger/source-url-comment-expected.txt
@@ -6,14 +6,14 @@ Running: testSourceURLCommentInInlineScript
 
 Running: testSourceURLComment
 function keepAlive() {}
-//@ sourceURL=evalURL.js
+//# sourceURL=evalURL.js
 
 Running: testSourceURLCommentInDynamicScript
 function keepAliveInDynamicScript() {}
-//@ sourceURL=dynamicScriptURL.js
+//# sourceURL=dynamicScriptURL.js
 
 Running: testNonRelativeURL
 function relativeURLScript() {}
-//@ sourceURL=/js/nonRelativeURL.js
+//# sourceURL=/js/nonRelativeURL.js
 Debugger was disabled.