DevTools: fix co-existance of multiple DevTools extensions

LayoutTests/inspector/extensions/multiple-extensions-expected.txt

Index: LayoutTests/inspector/extensions/multiple-extensions-expected.txt
diff --git a/LayoutTests/inspector/extensions/multiple-extensions-expected.txt b/LayoutTests/inspector/extensions/multiple-extensions-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f8a73abba15c68780a7b610d732c458e93256b4a
--- /dev/null
+++ b/LayoutTests/inspector/extensions/multiple-extensions-expected.txt
@@ -0,0 +1,43 @@
+Tests co-existance of multiple DevTools extensions
+
+Started extension.
+Running tests...
+RUNNING TEST: extension_testCreatePanel
+Panel created
+{
+    createStatusBarButton : <function>
+    onHidden : {
+        addListener : <function>
+        removeListener : <function>
+    }
+    onSearch : {
+        addListener : <function>
+        removeListener : <function>
+    }
+    onShown : {
+        addListener : <function>
+        removeListener : <function>
+    }
+    show : <function>
+}
+Started extension.
+Running tests...
+RUNNING TEST: extension_testCreatePanel
+Panel created
+{
+    createStatusBarButton : <function>
+    onHidden : {
+        addListener : <function>
+        removeListener : <function>
+    }
+    onSearch : {
+        addListener : <function>
+        removeListener : <function>
+    }
+    onShown : {
+        addListener : <function>
+        removeListener : <function>
+    }
+    show : <function>
+}
+