Remove no longer needed BlinkTestRunner::proxy_ field.

content/shell/renderer/layout_test/blink_test_runner.h

Index: content/shell/renderer/layout_test/blink_test_runner.h
diff --git a/content/shell/renderer/layout_test/blink_test_runner.h b/content/shell/renderer/layout_test/blink_test_runner.h
index dd622ad5ef81052309bd17e8ac9e5ee45c3542ad..c5329e00f3fbe585c9c75f773280a7293cc1cff5 100644
--- a/content/shell/renderer/layout_test/blink_test_runner.h
+++ b/content/shell/renderer/layout_test/blink_test_runner.h
@@ -162,9 +162,6 @@ class BlinkTestRunner : public RenderViewObserver,
   // also resets additional state, like the main frame's name and opener.
   void Reset(bool for_new_test);
 
-  void set_proxy(test_runner::WebTestProxyBase* proxy) { proxy_ = proxy; }
-  test_runner::WebTestProxyBase* proxy() const { return proxy_; }
-
   void ReportLeakDetectionResult(const LeakDetectionResult& result);
 
   // Message handlers forwarded by LayoutTestRenderFrameObserver.
@@ -197,8 +194,6 @@ class BlinkTestRunner : public RenderViewObserver,
   GetBluetoothFakeAdapterSetter();
   mojom::LayoutTestBluetoothFakeAdapterSetterPtr bluetooth_fake_adapter_setter_;
 
-  test_runner::WebTestProxyBase* proxy_;
-
   test_runner::TestPreferences prefs_;
 
   ShellTestConfiguration test_config_;