Convert the infobars interactive_ui_test to a browser_test. Remove the ExtensionProxy class which…

chrome/test/webdriver/webdriver_session.h

Index: chrome/test/webdriver/webdriver_session.h
===================================================================
--- chrome/test/webdriver/webdriver_session.h	(revision 132618)
+++ chrome/test/webdriver/webdriver_session.h	(working copy)
@@ -308,9 +308,6 @@
   // Waits for all views to stop loading. Returns true on success.
   Error* WaitForAllViewsToStopLoading();
 
-  // Install packed extension at |path|.
-  Error* InstallExtensionDeprecated(const FilePath& path);
-
   // Install extension at |path|.
   Error* InstallExtension(const FilePath& path, std::string* extension_id);