[Signin][Android] Rename OAuth2TokenService JNI method

This CL initially changed the JNI interface to its modern form.
https://crrev.com/c/1814696 was landed first, also containing this
change, so this one now renames simply renames oAuth2TokenFetched to
onOAuth2TokenFetched as discussed with Boris in the comments.

Bug: 934688
Change-Id: I90a8f19ef643f0a15f5d8140932be6f15d898636
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1760294
Commit-Queue: Pâris Meuleman <pmeuleman@chromium.org>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Auto-Submit: Pâris Meuleman <pmeuleman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701085}

components/signin/core/browser/android/java/src/org/chromium/components/signin/OAuth2TokenService.java

@@ -135,21 +135,21 @@ public final class OAuth2TokenService
             String username, String scope, final long nativeCallback) {
         Account account = getAccountOrNullFromUsername(username);
         if (account == null) {
-            ThreadUtils.postOnUiThread(()
-                                               -> OAuth2TokenServiceJni.get().oAuth2TokenFetched(
-                                                       null, false, nativeCallback));
+            ThreadUtils.postOnUiThread(() -> {
+                OAuth2TokenServiceJni.get().onOAuth2TokenFetched(null, false, nativeCallback);
+            });
             return;
         }
         String oauth2Scope = OAUTH2_SCOPE_PREFIX + scope;
         getAccessToken(account, oauth2Scope, new GetAccessTokenCallback() {
             @Override
             public void onGetTokenSuccess(String token) {
-                OAuth2TokenServiceJni.get().oAuth2TokenFetched(token, false, nativeCallback);
+                OAuth2TokenServiceJni.get().onOAuth2TokenFetched(token, false, nativeCallback);
             }
 
             @Override
             public void onGetTokenFailure(boolean isTransientError) {
-                OAuth2TokenServiceJni.get().oAuth2TokenFetched(
+                OAuth2TokenServiceJni.get().onOAuth2TokenFetched(
                         null, isTransientError, nativeCallback);
             }
         });
@@ -398,7 +398,8 @@ public final class OAuth2TokenService
 
     @NativeMethods
     interface Natives {
-        void oAuth2TokenFetched(String authToken, boolean isTransientError, long nativeCallback);
+        void onOAuth2TokenFetched(
+                String authToken, boolean isTransientError, long nativeCallback);
         void updateAccountList(long nativeOAuth2TokenServiceDelegateAndroid,
                 OAuth2TokenService caller, String currentlySignedInAccount);
     }

components/signin/internal/identity_manager/oauth2_token_service_delegate_android.cc

@@ -488,7 +488,7 @@ CoreAccountId OAuth2TokenServiceDelegateAndroid::MapAccountNameToAccountId(
 
 // Called from Java when fetching of an OAuth2 token is finished. The
 // |authToken| param is only valid when |result| is true.
-void JNI_OAuth2TokenService_OAuth2TokenFetched(
+void JNI_OAuth2TokenService_OnOAuth2TokenFetched(
     JNIEnv* env,
     const JavaParamRef<jstring>& authToken,
     jboolean isTransientError,