[cr145] Removes logging of CopyFromSurfaceError.

Per review feedback.

Chromium change:

https://source.chromium.org/chromium/chromium/src/+/9d2b3244101ccd0eb8321d3027c648ec4a1b14e2

commit 9d2b3244101ccd0eb8321d3027c648ec4a1b14e2
Author: Dave Tapuska <dtapuska@chromium.org>
Date:   Thu Jan 15 07:32:24 2026 -0800

    Set timeout from multi source page context fetcher

    - Change the result code on CopyFromSurface so we can log a uma histogram
    instead of an arbitrary string
    - Pass timeout to viz, set the browser side timeout to be 500ms later to
    give the IPC enough time.

    Bug: b:447589565

components/ai_chat/content/browser/page_content_fetcher.cc

@@ -469,8 +469,6 @@ class PageContentFetcherInternal {
 void OnScreenshot(FetchPageContentCallback callback,
                   const content::CopyFromSurfaceResult& result) {
   if (!result.has_value()) {
-    LOG(ERROR) << "RenderWidgetHostView::CopyFromSurface failed with: "
-               << result.error();
     std::move(callback).Run("", false, "");
     return;
   }