Split DumpPixelsAsync in pixel_dump.h into more granular functions.

content/shell/test_runner/web_test_runner.h

Index: content/shell/test_runner/web_test_runner.h
diff --git a/content/shell/test_runner/web_test_runner.h b/content/shell/test_runner/web_test_runner.h
index 5dd449c43aabd740ac72b77de7bd7e5ce90096b7..6efaec303381fc119100769d58f5a32460f9d614 100644
--- a/content/shell/test_runner/web_test_runner.h
+++ b/content/shell/test_runner/web_test_runner.h
@@ -56,8 +56,8 @@ class WebTestRunner {
   // and calls |callback| with the result.  Caller needs to ensure that
   // |web_view| stays alive until |callback| is called.
   virtual void DumpPixelsAsync(
-      blink::WebView* web_view,
-      const base::Callback<void(const SkBitmap&)>& callback) = 0;
+      blink::WebLocalFrame* frame,
+      base::OnceCallback<void(const SkBitmap&)> callback) = 0;
 
   // Replicates changes to layout test runtime flags
   // (i.e. changes that happened in another renderer).