Fix unnecessary toggle changed calls on incognito ntp

Add a check to only call the cookie controls service if the new state is
different from the previous state, because calling setChecked
programmatically triggers onCheckedChanged.

Bug: 1040091
Change-Id: I639a08cf47e365a3542c94b18ba680defca55b99
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2132209Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Commit-Queue: Ehimare Okoyomon <eokoyomon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755398}

chrome/android/java/src/org/chromium/chrome/browser/ntp/IncognitoCookieControlsManager.java

@@ -119,8 +119,7 @@ public class IncognitoCookieControlsManager
 
     @Override
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
-        if (mEnforcement == CookieControlsEnforcement.NO_ENFORCEMENT
-                && (buttonView.getId() == R.id.cookie_controls_card_toggle)) {
+        if (isChecked != mChecked && (buttonView.getId() == R.id.cookie_controls_card_toggle)) {
             mServiceBridge.handleCookieControlsToggleChanged(isChecked);
         }
     }