[DevTools] Use no-referrer for DevTools links

Bug: 732751
Change-Id: I77753120e2424203dedcc7bc0847fb67f87fe2b2
Reviewed-on: https://chromium-review.googlesource.com/615021
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#494413}
content::KeyboardEventProcessingResult DevToolsWindow::PreHandleKeyboardEvent(
    WebContents* source,
    const content::NativeWebKeyboardEvent& event) {
  BrowserWindow* inspected_window = GetInspectedBrowserWindow();
  if (inspected_window) {
    return inspected_window->PreHandleKeyboardEvent(event);
  }
  return content::KeyboardEventProcessingResult::NOT_HANDLED;
}

content::KeyboardEventProcessingResult DevToolsWindow::PreHandleKeyboardEvent(
    WebContents* source,
    const content::NativeWebKeyboardEvent& event) {
  BrowserWindow* inspected_window = GetInspectedBrowserWindow();
  if (inspected_window) {
    return inspected_window->PreHandleKeyboardEvent(event);
  }
  return content::KeyboardEventProcessingResult::NOT_HANDLED;
}
