Refactor: Make PyAuto InstallExtension() take a string. Delete dead code.

chrome/test/pyautolib/pyautolib.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/memory/scoped_ptr.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/test/automation/automation_proxy.h"
 #include "chrome/test/automation/extension_proxy.h"
@@ skipping 184 matching lines @@
   bool app_closed;
   return CloseBrowser(browser_proxy.get(), &app_closed);
 }
 
 int PyUITestBase::GetBrowserWindowCount() {
   int num_windows = 0;
   EXPECT_TRUE(automation()->GetBrowserWindowCount(&num_windows));
   return num_windows;
 }
 
-std::string PyUITestBase::InstallExtension(const FilePath& crx_file,
+std::string PyUITestBase::InstallExtension(const std::string& extension_path,
                                            bool with_ui) {
+#if defined(OS_WIN)
+  FilePath extension_file_path = FilePath(ASCIIToWide(extension_path));
+#else
+  FilePath extension_file_path = FilePath(extension_path);
+#endif
   scoped_refptr<ExtensionProxy> proxy =
-      automation()->InstallExtension(crx_file, with_ui);
+      automation()->InstallExtension(extension_file_path, with_ui);
   std::string id;
   if (!proxy.get() || !proxy.get()->GetId(&id))
     return "";
   return id;
 }
 
 bool PyUITestBase::GetBookmarkBarVisibility() {
   scoped_refptr<BrowserProxy> browser_proxy =
       automation()->GetBrowserWindow(0);  // Window doesn't matter.
   EXPECT_TRUE(browser_proxy.get());
@@ skipping 179 matching lines @@
   // TODO(phadjan.jr): figure out a way to unambiguously report error.
   if (!browser_proxy.get())
     return cookie_val;
   scoped_refptr<TabProxy> tab_proxy = browser_proxy->GetTab(tab_index);
   EXPECT_TRUE(tab_proxy.get());
   if (!tab_proxy.get())
     return cookie_val;
   EXPECT_TRUE(tab_proxy->GetCookies(cookie_url, &cookie_val));
   return cookie_val;
 }