Revert 94073 (broke a ton of tests) - Introduce a field trial for Instant.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
===================================================================
--- chrome/common/pref_names.cc	(revision 94076)
+++ chrome/common/pref_names.cc	(working copy)
@@ -275,10 +275,6 @@
 // Time when instant was last enabled.
 const char kInstantEnabledTime[] = "instant.enabled_time";
 
-// Random number drawn and used by the Instant field trial. Stored in prefs to
-// provide a consistent field trial experience across browser restarts.
-const char kInstantFieldTrialRandomDraw[] = "instant.field_trial_random_draw";
-
 // Used to maintain instant promo keys. See PromoCounter for details of subkeys
 // that are used.
 const char kInstantPromo[] = "instant.promo";