Correct the flag: is_extension_upgrade, which denote whether the extension is being upgrading.

chrome/browser/extensions/extension_service.h

Index: chrome/browser/extensions/extension_service.h
diff --git a/chrome/browser/extensions/extension_service.h b/chrome/browser/extensions/extension_service.h
index 15645875447357ba74104449b8a584ce725fe9b2..a4c3ca0bd35a215d604f0e3a7e3c1f0638513363 100644
--- a/chrome/browser/extensions/extension_service.h
+++ b/chrome/browser/extensions/extension_service.h
@@ -765,7 +765,7 @@ class ExtensionService
   // Disables the extension if the privilege level has increased
   // (e.g., due to an upgrade).
   void CheckPermissionsIncrease(const extensions::Extension* extension,
-                                bool is_upgrade);
+                                bool is_extension_installed);
 
   // Helper that updates the active extension list used for crash reporting.
   void UpdateActiveExtensionsInCrashReporter();