Add header and remove button to account detail page.

- Add account header which contains the account icon and name to the top
  of the account detail page.
- Also add the remove account button to the bottom of the page.

Change-Id: I24f1a17a7f9c4dd8c840a2b0329c0965e4e612e9
Fix: 33543525
Test: make RunSettingsRoboTests