Remove unused themes on clicking the reset theme button

chrome/browser/extensions/extension_install_ui_browsertest.cc

 // Copyright (c) 2012 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/string_util.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/theme_installed_infobar_delegate.h"
 #include "chrome/browser/infobars/infobar_service.h"
@@ skipping 56 matching lines @@
   // Install theme once and undo to verify we go back to default theme.
   base::FilePath theme_crx = PackExtension(test_data_dir_.AppendASCII("theme"));
   ASSERT_TRUE(InstallExtensionWithUIAutoConfirm(theme_crx, 1, browser()));
   const Extension* theme = GetTheme();
   ASSERT_TRUE(theme);
   std::string theme_id = theme->id();
   VerifyThemeInfoBarAndUndoInstall();
   ASSERT_EQ(NULL, GetTheme());
 
   // Set the same theme twice and undo to verify we go back to default theme.
-  // We set the |expected_change| to zero in these 'InstallExtensionWithUI'
-  // calls since the theme has already been installed above and this is an
-  // overinstall to set the active theme.
-  ASSERT_TRUE(InstallExtensionWithUIAutoConfirm(theme_crx, 0, browser()));
+  ASSERT_TRUE(InstallExtensionWithUIAutoConfirm(theme_crx, 1, browser()));
   theme = GetTheme();
   ASSERT_TRUE(theme);
   ASSERT_EQ(theme_id, theme->id());
   ASSERT_TRUE(InstallExtensionWithUIAutoConfirm(theme_crx, 0, browser()));
   theme = GetTheme();
   ASSERT_TRUE(theme);
   ASSERT_EQ(theme_id, theme->id());
   VerifyThemeInfoBarAndUndoInstall();
   ASSERT_EQ(NULL, GetTheme());
 }
@@ skipping 66 matching lines @@
     EXPECT_EQ(num_normal_tabs + 1, browser()->tab_strip_model()->count());
     WebContents* web_contents =
         browser()->tab_strip_model()->GetActiveWebContents();
     ASSERT_TRUE(web_contents);
     EXPECT_TRUE(StartsWithASCII(web_contents->GetURL().spec(),
                                 "chrome://newtab/", false));
   } else {
     // TODO(xiyuan): Figure out how to test extension installed bubble?
   }
 }