Misc search fix

- Remove incorrect summary from set date/time
- Remove some unused resources
- Remove ability to clear individual search history
- Add remove all query history menu item

Change-Id: I4383d075310297163fd2206d1a5b9c8f4ed94078
Fix: 62741488
Fix: 31589605
Test: robotests

tests/robotests/src/com/android/settings/search/IntentSearchViewHolderTest.java

@@ -85,7 +85,7 @@ public class IntentSearchViewHolderTest {
         View view = LayoutInflater.from(context).inflate(R.layout.search_intent_item, null);
         mHolder = new IntentSearchViewHolder(view);
 
-        mIcon = context.getDrawable(R.drawable.ic_search_history);
+        mIcon = context.getDrawable(R.drawable.ic_search_24dp);
         mBadgedIcon = context.getDrawable(R.drawable.ic_add);
         when(mFragment.getActivity().getPackageManager()).thenReturn(mPackageManager);
     }