Make MockScreenOrientationClient an internal detail of components/test_runner.

components/test_runner/web_test_delegate.h

Index: components/test_runner/web_test_delegate.h
diff --git a/components/test_runner/web_test_delegate.h b/components/test_runner/web_test_delegate.h
index 32a34571487a9de21f366a3dd29ff401c6cec766..8a0edeac1856a80aa02f24d5594aa60cfc231e1f 100644
--- a/components/test_runner/web_test_delegate.h
+++ b/components/test_runner/web_test_delegate.h
@@ -77,17 +77,6 @@ class WebTestDelegate {
   virtual void SetDeviceOrientationData(
       const blink::WebDeviceOrientationData& data) = 0;
 
-  // Set orientation to set when registering via
-  // Platform::setScreenOrientationListener().
-  virtual void SetScreenOrientation(
-      const blink::WebScreenOrientationType& orientation) = 0;
-
-  // Reset the screen orientation data used for testing.
-  virtual void ResetScreenOrientation() = 0;
-
-  // Disables screen orientation test-specific mock.
-  virtual void DisableMockScreenOrientation() = 0;
-
   // Add a message to the text dump for the layout test.
   virtual void PrintMessage(const std::string& message) = 0;