ash: A number of ui/ux changes from feedback/to better match the mocks.

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index d3a794a2c2e3f4ccfe3666896310bf7f47cd2346..665aa925b1840a7c8f416f9b0f4118a326b59834 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -227,11 +227,11 @@ class DummySystemTrayDelegate : public SystemTrayDelegate {
 
   // Overridden from SystemTrayDelegate:
   virtual const std::string GetUserDisplayName() const OVERRIDE {
-    return "chronos";
+    return "Über tray";
   }
 
   virtual const std::string GetUserEmail() const OVERRIDE {
-    return "chr@nos";
+    return "über@tray";
   }
 
   virtual const SkBitmap& GetUserImage() const OVERRIDE {