Change platform verification string to hostname only

BUG=1146646
TEST=Verified UI only shows hostname in dialog

Change-Id: I80df7f5f0c5d582649e9cf30c9dfd00f65407d91
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2615298
Auto-Submit: Jeffrey Kardatzke <jkardatzke@google.com>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841135}

chrome/browser/chromeos/attestation/platform_verification_dialog.cc

@@ -61,7 +61,7 @@ views::Widget* PlatformVerificationDialog::ShowDialog(
 
   // TODO(xhwang): We should only show the name if the request is from the
   // extension's true frame. See http://crbug.com/455821
-  std::string origin = extension ? extension->name() : requesting_origin.spec();
+  std::string origin = extension ? extension->name() : requesting_origin.host();
 
   PlatformVerificationDialog* dialog = new PlatformVerificationDialog(
       web_contents, base::UTF8ToUTF16(origin), std::move(callback));