Tests for incognito app install, plus some cleanup.

chrome/browser/extensions/extension_browsertest.h

Index: chrome/browser/extensions/extension_browsertest.h
diff --git a/chrome/browser/extensions/extension_browsertest.h b/chrome/browser/extensions/extension_browsertest.h
index 9b7f5f00efdee22ff6e6cd10bbc62e295770ca26..5324196bf3ec2b2cf6deef6b07a14759d87c88da 100644
--- a/chrome/browser/extensions/extension_browsertest.h
+++ b/chrome/browser/extensions/extension_browsertest.h
@@ -52,6 +52,12 @@ class ExtensionBrowserTest
     return InstallOrUpdateExtension("", path, INSTALL_UI_TYPE_NORMAL,
                                     expected_change);
   }
+  bool InstallExtensionWithUIAutoConfirm(const FilePath& path,
+                                         int expected_change,
+                                         Profile* profile) {
+    return InstallOrUpdateExtension("", path, INSTALL_UI_TYPE_AUTO_CONFIRM,
+                                    expected_change, profile);
+  }
 
   // Begins install process but simulates a user cancel.
   bool StartInstallButCancel(const FilePath& path) {
@@ -109,11 +115,16 @@ class ExtensionBrowserTest
     INSTALL_UI_TYPE_NONE,
     INSTALL_UI_TYPE_CANCEL,
     INSTALL_UI_TYPE_NORMAL,
+    INSTALL_UI_TYPE_AUTO_CONFIRM,
   };
 
   bool InstallOrUpdateExtension(const std::string& id, const FilePath& path,
                                 InstallUIType ui_type,
                                 int expected_change);
+  bool InstallOrUpdateExtension(const std::string& id, const FilePath& path,
+                                InstallUIType ui_type,
+                                int expected_change,
+                                Profile* profile);
   bool LoadExtensionImpl(const FilePath& path, bool incognito_enabled);
 
   bool WaitForExtensionHostsToLoad();