Return early if Safe Browsing state isn't changed.

Bug: 1097310
Change-Id: Iac117bddb711cbd493c05e8a86a40ca8d00f0130
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2353090Reviewed-by: Varun Khaneja <vakh@chromium.org>
Commit-Queue: Xinghui Lu <xinghuilu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797381}

chrome/browser/safe_browsing/android/java/src/org/chromium/chrome/browser/safe_browsing/settings/SecuritySettingsFragment.java

@@ -118,10 +118,12 @@ public class SecuritySettingsFragment extends PreferenceFragmentCompat
         int newState = (int) newValue;
         @SafeBrowsingState
         int currentState = SafeBrowsingBridge.getSafeBrowsingState();
+        if (newState == currentState) {
+            return true;
+        }
         // If the user selects no protection from another Safe Browsing state, show a confirmation
         // dialog to double check if they want to select no protection.
-        if (newState == SafeBrowsingState.NO_SAFE_BROWSING
-                && currentState != SafeBrowsingState.NO_SAFE_BROWSING) {
+        if (newState == SafeBrowsingState.NO_SAFE_BROWSING) {
             // The user hasn't confirmed to select no protection, keep the radio button / UI checked
             // state at the currently selected level.
             mSafeBrowsingPreference.setCheckedState(currentState);