Remove legacy WebPageOverlay method.

Source/web/WebPageOverlay.cpp

Index: Source/web/WebPageOverlay.cpp
diff --git a/Source/web/WebPageOverlay.cpp b/Source/web/WebPageOverlay.cpp
deleted file mode 100644
index 7d3260bca3e31c95ca5db44259068904d5c3b692..0000000000000000000000000000000000000000
--- a/Source/web/WebPageOverlay.cpp
+++ /dev/null
@@ -1,30 +0,0 @@
-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "config.h"
-#include "public/web/WebPageOverlay.h"
-
-#include "public/platform/WebSize.h"
-#include "public/web/WebGraphicsContext.h"
-#include "third_party/skia/include/core/SkCanvas.h"
-#include "third_party/skia/include/core/SkRect.h"
-
-namespace blink {
-
-void WebPageOverlay::paintPageOverlay(WebGraphicsContext* context, const WebSize& webViewSize)
-{
-    WebFloatRect rect(0, 0, webViewSize.width, webViewSize.height);
-    WebCanvas* canvas = context->beginDrawing(rect);
-    int saveCount = canvas->save();
-    canvas->clipRect(SkRect::MakeWH(webViewSize.width, webViewSize.height));
-    paintPageOverlay(canvas);
-    canvas->restoreToCount(saveCount);
-    context->endDrawing();
-}
-
-void WebPageOverlay::paintPageOverlay(WebCanvas*)
-{
-}
-
-} // namespace blink