BrowserPanel: Extract out magic string
BrowserPanel: Extract out magic string

BrowserPanel navigates to a fixed URL when a person is being displayed.

We should extract the URL to a constant.

Let's extract the URL out as a constant named
BrowserPanel#GOOGLE_SEARCH_URL_PREFIX.

damithc/addressbook-level4,CS2103R-Eugene-Peh/addressbook-level4,CS2103R-Eugene-Peh/addressbook-level4,damithc/addressbook-level4,CS2103R-Eugene-Peh/addressbook-level4,damithc/addressbook-level4,se-edu/addressbook-level3