Revert "Add IPC benchmarking API to Blink TestRunner"

content/shell/renderer/test_runner/WebTestDelegate.h

Index: content/shell/renderer/test_runner/WebTestDelegate.h
diff --git a/content/shell/renderer/test_runner/WebTestDelegate.h b/content/shell/renderer/test_runner/WebTestDelegate.h
index 3d0bf614384187b7ca91f7ababbca352b2120067..1b0af10b85d58b001fea4ca77faf30467097b8d1 100644
--- a/content/shell/renderer/test_runner/WebTestDelegate.h
+++ b/content/shell/renderer/test_runner/WebTestDelegate.h
@@ -168,11 +168,6 @@ public:
     // Returns a text dump the back/forward history for the WebView associated
     // with the given WebTestProxyBase.
     virtual std::string dumpHistoryForWindow(WebTestProxyBase*) = 0;
-
-    // Send an IPC message will will be echoed back.
-    virtual void requestEcho(int id, int size) = 0;
-    virtual int lastEchoId() = 0;
-    virtual int lastEchoSize() = 0;
 };
 
 }  // namespace content