Deprecate CredentialRequestOptions.unmediated in favor mediation enum

tools/metrics/histograms/enums.xml

Index: tools/metrics/histograms/enums.xml
diff --git a/tools/metrics/histograms/enums.xml b/tools/metrics/histograms/enums.xml
index 308ad183647e55fc6e6300261b1996cc10bf583a..3f09050fe2dff3e93d29f099b92c3896e3c88d82 100644
--- a/tools/metrics/histograms/enums.xml
+++ b/tools/metrics/histograms/enums.xml
@@ -13936,8 +13936,8 @@ uploading your change for review.  These are checked by presubmit scripts.
   <int value="958" label="BackspaceNavigatedBackAfterFormInteraction"/>
   <int value="959" label="CSPSourceWildcardWouldMatchExactHost"/>
   <int value="960" label="CredentialManagerGet"/>
-  <int value="961" label="CredentialManagerGetWithUI"/>
-  <int value="962" label="CredentialManagerGetWithoutUI"/>
+  <int value="961" label="CredentialManagerGetMediationOptional"/>
+  <int value="962" label="CredentialManagerGetMediationSilent"/>
   <int value="963" label="CredentialManagerStore"/>
   <int value="964" label="CredentialManagerRequireUserMediation"/>
   <int value="965" label="RequestAutocomplete"/>
@@ -14985,6 +14985,9 @@ uploading your change for review.  These are checked by presubmit scripts.
   <int value="1976" label="PaymentRequestNetworkNameInSupportedMethods"/>
   <int value="1977" label="CrossOriginPropertyAccess"/>
   <int value="1978" label="CrossOriginPropertyAccessFromOpener"/>
+  <int value="1979"
+      label="CredentialManagerCredentialRequestOptionsUnmediated"/>
+  <int value="1980" label="CredentialManagerGetMediationRequired"/>
 </enum>
 
 <enum name="FeedbackSource" type="int">