[FedCM] Rename given_name to givenName in IdentityUserInfo

Fixed: 1445775
Change-Id: I038ac72f3df8e20961cc78a5fcbe95b828a3f028
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4566448
Commit-Queue: Nicolás Peña <npm@chromium.org>
Reviewed-by: Yi Gu <yigu@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1149284}

credential-management/fedcm-network-requests.https.html

@@ -211,6 +211,9 @@
   assert_equals(message.result, "Pass");
   assert_equals(message.numAccounts, 1);
   assert_equals(message.firstAccountEmail, "john_doe@idp.example");
+  assert_equals(message.firstAccountName, "John Doe");
+  assert_equals(message.firstAccountGivenName, "John");
+  assert_equals(message.firstAccountPicture, "https://idp.example/profile/123");
 }, 'Test basic User InFo API flow');
 
 fedcm_test(async t => {

credential-management/support/fedcm/userinfo-iframe.html

@@ -22,7 +22,10 @@
     let results = {
       result: "Pass",
       numAccounts: user_info.length,
-      firstAccountEmail: user_info[0].email
+      firstAccountEmail: user_info[0].email,
+      firstAccountName: user_info[0].name,
+      firstAccountGivenName: user_info[0].givenName,
+      firstAccountPicture: user_info[0].picture
     };
     window.top.postMessage(results, '*');
   } catch (error) {