Replace "external_install" boolean parameter with explicit enumeration in ExtensionUninstall method.

chrome/browser/extensions/shared_module_service.cc

Index: chrome/browser/extensions/shared_module_service.cc
diff --git a/chrome/browser/extensions/shared_module_service.cc b/chrome/browser/extensions/shared_module_service.cc
index 78e9ab74e21c6c06c95f8661e9c110e776fb5aea..9de170a23bbdfd9cdd3930c802cf1b282bd78f40 100644
--- a/chrome/browser/extensions/shared_module_service.cc
+++ b/chrome/browser/extensions/shared_module_service.cc
@@ -153,9 +153,10 @@ void SharedModuleService::PruneSharedModulesOnUninstall(
       scoped_ptr<const ExtensionSet> dependents =
           GetDependentExtensions(imported_module);
       if (dependents->is_empty()) {
-        service->UninstallExtension(iter->extension_id,
-                                    true,  // External uninstall.
-                                    NULL);  // Ignore error.
+        service->UninstallExtension(
+            iter->extension_id,
+            ExtensionService::kUninstallReasonOrphanedSharedModule,
+            NULL);  // Ignore error.
       }
     }
   }