Replace all enums with enum classes in permissions code.

chrome/browser/permissions/permission_infobar_delegate.cc

Index: chrome/browser/permissions/permission_infobar_delegate.cc
diff --git a/chrome/browser/permissions/permission_infobar_delegate.cc b/chrome/browser/permissions/permission_infobar_delegate.cc
index 95f748a2e0845ff4806ce52d50efe8303fd19a88..d217feb87181aa73a7127ab593ac1cc7e5a75b49 100644
--- a/chrome/browser/permissions/permission_infobar_delegate.cc
+++ b/chrome/browser/permissions/permission_infobar_delegate.cc
@@ -103,7 +103,7 @@ bool PermissionInfoBarDelegate::Accept() {
         content_settings_type_, persist_);
   }
 
-  SetPermission(update_content_setting, GRANTED);
+  SetPermission(update_content_setting, PermissionAction::GRANTED);
   return true;
 }
 
@@ -115,12 +115,12 @@ bool PermissionInfoBarDelegate::Cancel() {
         content_settings_type_, persist_);
   }
 
-  SetPermission(update_content_setting, DENIED);
+  SetPermission(update_content_setting, PermissionAction::DENIED);
   return true;
 }
 
 void PermissionInfoBarDelegate::InfoBarDismissed() {
-  SetPermission(false, DISMISSED);
+  SetPermission(false, PermissionAction::DISMISSED);
 }
 
 base::string16 PermissionInfoBarDelegate::GetButtonLabel(