Remove omnibox_search_hint.(cc,h).

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 40abeab8cb12b93999720ecd6b4fa42be8bbd767..e0e1c5ba2be4b8674f0104168ee76fcaf9fe2bcc 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1055,10 +1055,6 @@ const char kShowUpdatePromotionInfoBar[] =
 // true, we draw a custom chrome frame (thicker title bar and blue border).
 const char kUseCustomChromeFrame[] = "browser.custom_chrome_frame";
 
-// Boolean that indicates whether the infobar explaining that search can be
-// done directly from the omnibox should be shown.
-const char kShowOmniboxSearchHint[] = "browser.show_omnibox_search_hint";
-
 // The preferred position (which corner of screen) for desktop notifications.
 const char kDesktopNotificationPosition[] =
     "browser.desktop_notification_position";