Use stricter type checking in UMA_HISTOGRAM_ENUMERATION

components/signin/core/browser/signin_metrics.h

Index: components/signin/core/browser/signin_metrics.h
diff --git a/components/signin/core/browser/signin_metrics.h b/components/signin/core/browser/signin_metrics.h
index cc6709e2958b9bd20482ca26d3c9c7cff8fd6ff9..52f3f09578da5d1254fb2ae6e70d39106f462cb3 100644
--- a/components/signin/core/browser/signin_metrics.h
+++ b/components/signin/core/browser/signin_metrics.h
@@ -53,7 +53,7 @@ enum ProfileSignout {
 };
 
 // Enum values used for use with "AutoLogin.Reverse" histograms.
-enum {
+enum APAction {
   // The infobar was shown to the user.
   HISTOGRAM_SHOWN,
   // The user pressed the accept button to perform the suggested action.
@@ -82,7 +82,7 @@ enum {
 
 // Enum values used with the "Signin.OneClickConfirmation" histogram, which
 // tracks the actions used in the OneClickConfirmation bubble.
-enum {
+enum ConfirmationUsage {
   HISTOGRAM_CONFIRM_SHOWN,
   HISTOGRAM_CONFIRM_OK,
   HISTOGRAM_CONFIRM_RETURN,
@@ -353,7 +353,7 @@ void LogExternalCcResultFetches(
 // Track when the current authentication error changed.
 void LogAuthError(GoogleServiceAuthError::State auth_error);
 
-void LogSigninConfirmHistogramValue(int action);
+void LogSigninConfirmHistogramValue(ConfirmationUsage action);
 
 void LogXDevicePromoEligible(CrossDevicePromoEligibility metric);