Remove a use of "master" in a comment

Bug: 1099072
Change-Id: I04279a29202f217a5ed838af9319874a3adb63b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438876
Auto-Submit: Avi Drissman <avi@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812191}

components/autofill/core/browser/autofill_policy_handler.cc

@@ -37,7 +37,7 @@ void AutofillPolicyHandler::ApplyPolicySettings(
   bool autofill_enabled;
   if (value && value->GetAsBoolean(&autofill_enabled) && !autofill_enabled) {
     prefs->SetBoolean(autofill::prefs::kAutofillEnabledDeprecated, false);
-    // Disable the fine-grained prefs if the master pref is disabled by policy.
+    // Disable the fine-grained prefs if the main pref is disabled by policy.
     prefs->SetBoolean(autofill::prefs::kAutofillCreditCardEnabled, false);
     prefs->SetBoolean(autofill::prefs::kAutofillProfileEnabled, false);
   }