[cr138][Android] Fixed FieldCanBeFinal Prone checks

This is an automated change, made by set
`ERRORPRONE_CHECKS_TO_APPLY = ['FieldCanBeFinal']`
at `src/build/android/gyp/errorprone.py` and run the build with --offline flag

Chromium change:
https://source.chromium.org/chromium/chromium/src/+/4f7d0b80759a7fd39de219f56984ec686d7aa257

	Android: Enable Error Prone checks: FieldCanBeStatic, FieldCanBeFinal, FieldCanBeLocal

	Leaves FieldCanBeStatic off in tests, since it's arguably nicer to use
	non-statics in test classes for expected values.

	Bug: 40661145
	Change-Id: I9fdbc6ebed5a6aa98f435dfeccb074715531be16
	Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6543826

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

@@ -16,7 +16,7 @@ import org.chromium.components.browser_ui.widget.RadioButtonWithDescriptionAndAu
 
 public class BraveRadioButtonGroupSafeBrowsingPreference
         extends RadioButtonGroupSafeBrowsingPreference {
-    private String noProtectionSummary;
+    private final String noProtectionSummary;
 
     public BraveRadioButtonGroupSafeBrowsingPreference(Context context, AttributeSet attrs) {
         super(context, attrs);