Code: ExtensionInstallDialogView::ExtensionInstallDialogView(
    Profile* profile,
    content::PageNavigator* navigator,
    const ExtensionInstallPrompt::DoneCallback& done_callback,
    std::unique_ptr<ExtensionInstallPrompt::Prompt> prompt)
    : profile_(profile),
      navigator_(navigator),
      done_callback_(done_callback),
       prompt_(std::move(prompt)),
       container_(NULL),
       scroll_view_(NULL),
      handled_result_(false) {
   InitView();
 }

Vulnerability Type: 
CWE ID: CWE-20
Summary: Lack of timeout on extension install prompt in Extensions in Google Chrome prior to 68.0.3440.75 allowed a remote attacker to trigger installation of an unwanted extension via a crafted HTML page.
Commit Message: [Extensions UI] Initially disabled OK button for extension install prompts and enable them after a 500 ms time period.

BUG=394518

Review-Url: https://codereview.chromium.org/2716353003
Cr-Commit-Position: refs/heads/master@{#461933}