athena: Show the hostname in the caption instead of the page-title.

BUG=401569
R=oshima@chromium.org

Review URL: https://codereview.chromium.org/456243002

Cr-Commit-Position: refs/heads/master@{#289061}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289061 0039d316-1c4b-4281-b951-d872f2087c98

athena/content/web_activity.cc

@@ -7,6 +7,7 @@
 #include "athena/activity/public/activity_factory.h"
 #include "athena/activity/public/activity_manager.h"
 #include "athena/input/public/accelerator_manager.h"
+#include "base/strings/utf_string_conversions.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/web_contents.h"
@@ -357,7 +358,9 @@ SkColor WebActivity::GetRepresentativeColor() const {
 }
 
 base::string16 WebActivity::GetTitle() const {
-  return web_view_ ? web_view_->GetWebContents()->GetTitle() : base::string16();
+  return web_view_ ? base::UTF8ToUTF16(
+                         web_view_->GetWebContents()->GetVisibleURL().host())
+                   : base::string16();
 }
 
 bool WebActivity::UsesFrame() const {