Move permission warning message handling from PermissionSet to PermissionMessageProvider.

chrome/browser/extensions/crx_installer.cc

Index: chrome/browser/extensions/crx_installer.cc
diff --git a/chrome/browser/extensions/crx_installer.cc b/chrome/browser/extensions/crx_installer.cc
index 2205608e8ccda96230a45502ecb4a8a4d09b932d..721a89390067fc555527d78416c7b98450a3f4bd 100644
--- a/chrome/browser/extensions/crx_installer.cc
+++ b/chrome/browser/extensions/crx_installer.cc
@@ -48,6 +48,7 @@
 #include "content/public/browser/resource_dispatcher_host.h"
 #include "content/public/browser/user_metrics.h"
 #include "extensions/common/manifest.h"
+#include "extensions/common/permissions/permission_message_provider.h"
 #include "extensions/common/user_script.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
@@ -272,9 +273,10 @@ CrxInstallerError CrxInstaller::AllowInstall(const Extension* extension) {
         if (error.empty()) {
           scoped_refptr<const PermissionSet> expected_permissions =
               PermissionsData::GetActivePermissions(dummy_extension.get());
-          valid = !(expected_permissions->HasLessPrivilegesThan(
-              PermissionsData::GetActivePermissions(extension),
-              extension->GetType()));
+          valid = !(PermissionMessageProvider::Get(extension->GetType())->
+                    IsPrivilegeIncrease(
+                        expected_permissions,
+                        PermissionsData::GetActivePermissions(extension)));
         }
       }
     }