Use larger size for icon in Advanced Protection scanning prompt.

Upon feedback from UX, we should be using GetErrorIconSize() in the APP
deep scanning prompts.

Bug: 1048199
Screenshot: https://screenshot.googleplex.com/CxJwRFQ66UQ.png
Change-Id: I9eba847f297520b1f3c5879bf8f748c0c69ad9f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2033753
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Auto-Submit: Daniel Rubery <drubery@chromium.org>
Reviewed-by: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737829}

chrome/browser/ui/views/download/download_item_view.cc

@@ -1241,7 +1241,7 @@ gfx::ImageSkia DownloadItemView::GetWarningIcon() {
 
     case download::DOWNLOAD_DANGER_TYPE_PROMPT_FOR_SCANNING:
       return gfx::CreateVectorIcon(
-          vector_icons::kHelpIcon, GetWarningIconSize(),
+          vector_icons::kHelpIcon, GetErrorIconSize(),
           GetNativeTheme()->GetSystemColor(
               ui::NativeTheme::kColorId_DefaultIconColor));