<webview>: Remove broken captureVisibleRegion code until feature is properly supported

extensions/browser/api/web_view/web_view_internal_api.h

Index: extensions/browser/api/web_view/web_view_internal_api.h
diff --git a/extensions/browser/api/web_view/web_view_internal_api.h b/extensions/browser/api/web_view/web_view_internal_api.h
index 7aebf6303dd0943e4aee9f279e6f38865f98e31f..ad66ed28ba97af15cdfa76cdc844bc8f44d8b102 100644
--- a/extensions/browser/api/web_view/web_view_internal_api.h
+++ b/extensions/browser/api/web_view/web_view_internal_api.h
@@ -115,25 +115,6 @@ class WebViewInternalInsertCSSFunction
   DISALLOW_COPY_AND_ASSIGN(WebViewInternalInsertCSSFunction);
 };
 
-class WebViewInternalCaptureVisibleRegionFunction
-    : public extensions::CaptureWebContentsFunction {
-  DECLARE_EXTENSION_FUNCTION("webViewInternal.captureVisibleRegion",
-                             WEBVIEWINTERNAL_CAPTUREVISIBLEREGION);
-
-  WebViewInternalCaptureVisibleRegionFunction();
-
- protected:
-  ~WebViewInternalCaptureVisibleRegionFunction() override;
-
- private:
-  // extensions::CaptureWebContentsFunction implementation.
-  bool IsScreenshotEnabled() override;
-  content::WebContents* GetWebContentsForID(int id) override;
-  void OnCaptureFailure(FailureReason reason) override;
-
-  DISALLOW_COPY_AND_ASSIGN(WebViewInternalCaptureVisibleRegionFunction);
-};
-
 class WebViewInternalSetNameFunction : public WebViewInternalExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("webViewInternal.setName",