Revert of Implement webview.captureVisibleRegion()

extensions/browser/api/guest_view/web_view/web_view_internal_api.h

Index: extensions/browser/api/guest_view/web_view/web_view_internal_api.h
diff --git a/extensions/browser/api/guest_view/web_view/web_view_internal_api.h b/extensions/browser/api/guest_view/web_view/web_view_internal_api.h
index 388491eac49ceed464d0007dadfc4d6eb1a0613c..dcdb8289a623a2429f9afcd9a783fe4b6c382553 100644
--- a/extensions/browser/api/guest_view/web_view/web_view_internal_api.h
+++ b/extensions/browser/api/guest_view/web_view/web_view_internal_api.h
@@ -8,8 +8,8 @@
 #include <stdint.h>
 
 #include "base/macros.h"
+#include "extensions/browser/api/capture_web_contents_function.h"
 #include "extensions/browser/api/execute_code_function.h"
-#include "extensions/browser/api/web_contents_capture_client.h"
 #include "extensions/browser/extension_function.h"
 #include "extensions/browser/guest_view/web_view/web_ui/web_ui_url_fetcher.h"
 #include "extensions/browser/guest_view/web_view/web_view_guest.h"
@@ -35,29 +35,6 @@
 
  private:
   virtual bool RunAsyncSafe(WebViewGuest* guest) = 0;
-};
-
-class WebViewInternalCaptureVisibleRegionFunction
-    : public WebViewInternalExtensionFunction,
-      public WebContentsCaptureClient {
- public:
-  DECLARE_EXTENSION_FUNCTION("webViewInternal.captureVisibleRegion",
-                             WEBVIEWINTERNAL_CAPTUREVISIBLEREGION);
-  WebViewInternalCaptureVisibleRegionFunction() {}
-
- protected:
-  ~WebViewInternalCaptureVisibleRegionFunction() override {}
-
- private:
-  // WebViewInternalExtensionFunction implementation.
-  bool RunAsyncSafe(WebViewGuest* guest) override;
-
-  // extensions::WebContentsCaptureClient:
-  bool IsScreenshotEnabled() override;
-  void OnCaptureSuccess(const SkBitmap& bitmap) override;
-  void OnCaptureFailure(FailureReason reason) override;
-
-  DISALLOW_COPY_AND_ASSIGN(WebViewInternalCaptureVisibleRegionFunction);
 };
 
 class WebViewInternalNavigateFunction