DevTools: Support XHR async call stacks in the debugger.

LayoutTests/http/tests/inspector/inspector-test.js

Index: LayoutTests/http/tests/inspector/inspector-test.js
diff --git a/LayoutTests/http/tests/inspector/inspector-test.js b/LayoutTests/http/tests/inspector/inspector-test.js
index 07508f9b08185c59621cdbbee9786a9c089b15ae..1c3611f80f8498f419570aae2d542bedbbf5e304 100644
--- a/LayoutTests/http/tests/inspector/inspector-test.js
+++ b/LayoutTests/http/tests/inspector/inspector-test.js
@@ -101,10 +101,6 @@ InspectorTest.check = function(passCondition, failureText)
 
 InspectorTest.addResult = function(text)
 {
-    if (InspectorTest._resultBufferring) {
-        InspectorTest._resultBufferringContent += text + "\n";
-        return;
-    }
     results.push(text);
     if (resultsSynchronized)
         InspectorTest.Output.addResult(text);
@@ -116,20 +112,6 @@ InspectorTest.addResult = function(text)
     }
 }
 
-InspectorTest.beginResultBufferring = function()
-{
-    InspectorTest._resultBufferring = true;
-    InspectorTest._resultBufferringContent = "";
-}
-
-InspectorTest.endResultBufferring = function()
-{
-    var result = InspectorTest._resultBufferringContent || "";
-    delete InspectorTest._resultBufferring;
-    delete InspectorTest._resultBufferringContent;
-    return result;
-}
-
 InspectorTest.addResults = function(textArray)
 {
     if (!textArray)