Revert of Simplify ExtensionInstallChecker into a single-use class

chrome/browser/extensions/unpacked_installer.h

Index: chrome/browser/extensions/unpacked_installer.h
diff --git a/chrome/browser/extensions/unpacked_installer.h b/chrome/browser/extensions/unpacked_installer.h
index e145befc654438bd87030b18a48489001240658e..c0416a20bdfaf4d064afbfc91cdb926ca3e98aed 100644
--- a/chrome/browser/extensions/unpacked_installer.h
+++ b/chrome/browser/extensions/unpacked_installer.h
@@ -14,14 +14,13 @@
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
+#include "chrome/browser/extensions/extension_install_checker.h"
 
 class ExtensionService;
-class Profile;
 
 namespace extensions {
 
 class Extension;
-class ExtensionInstallChecker;
 
 // Installs and loads an unpacked extension. Because internal state needs to be
 // held about the instalation process, only one call to Load*() should be made
@@ -118,20 +117,14 @@
   // Helper to get the Extension::CreateFlags for the installing extension.
   int GetFlags();
 
-  const Extension* extension() { return extension_.get(); }
+  const Extension* extension() { return install_checker_.extension().get(); }
 
   // The service we will report results back to.
   base::WeakPtr<ExtensionService> service_weak_;
 
-  // The Profile the extension is being installed in.
-  Profile* profile_;
-
   // The pathname of the directory to load from, which is an absolute path
   // after GetAbsolutePath has been called.
   base::FilePath extension_path_;
-
-  // The extension being installed.
-  scoped_refptr<const Extension> extension_;
 
   // If true and the extension contains plugins, we prompt the user before
   // loading.
@@ -146,7 +139,7 @@
 
   // Checks management policies and requirements before the extension can be
   // installed.
-  std::unique_ptr<ExtensionInstallChecker> install_checker_;
+  ExtensionInstallChecker install_checker_;
 
   CompletionCallback callback_;