Issue 6501: "Search" application stops when entering its settings

QuickSearchBox is missing declared class
since ics and jb.
This changes add this class, use the existings headers, and redirect to SearchableItemsFragment when
user click in the settings icon of the search bar.

Patchset 2: Fixed comment header


Change-Id: Icd616492c1fa4dd6342e4983865530c7b9e1a037
2 files changed