Commits on Jun 2, 2017

1. Add option to disable top site suggestions …

   Closes #4977
   
   Auditors:
   
   Test Plan 1:
   1. Open about:preferences#search
   2. Disable 'Show top site matches'
   3. Open a new tab
   4. Input 'face'
   5. Make sure that there does not appear the suggestions list
   
   Test Plan 2:
   1. Open about:preferences#search
   2. Enable 'Show top site matches'
   3. Open a new tab
   4. Input 'face'
   5. Make sure there appears the suggestions list, which has facebook.com

   Suguru Hirahara committed Jun 2, 2017
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