ntp: remove ShownSectionHandler and all references to it

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 7c3011d3a2296e33978b7305994baefdeedbae89..281c28428c1c93d4c5cb458a208e2d0f8647eea2 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1257,17 +1257,6 @@ const char kNTPShownBookmarksFolder[] = "ntp.shown_bookmarks_folder";
 // Which page should be visible on the new tab page v4
 const char kNTPShownPage[] = "ntp.shown_page";
 
-// Which sections should be visible on the new tab page
-// 1 - Show the most visited sites in a grid
-// 2 - Show the most visited sites as a list
-// 4 - Show the recent section
-// 8 - (Show tips -- DEPRECATED)
-// 16 - Show sync status
-const char kNTPShownSections[] = "ntp.shown_sections";
-
-// This pref is used for migrating the prefs for the NTP
-const char kNTPPrefVersion[] = "ntp.pref_version";
-
 // Dates between which the NTP should show a custom logo rather than the
 // standard one.
 const char kNTPCustomLogoStart[] = "ntp.alt_logo_start";