Do not show the install prompt for themes.

chrome/browser/extensions/webstore_inline_installer.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 "chrome/browser/extensions/webstore_inline_installer.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/string_util.h"
@@ skipping 355 matching lines @@
   manifest_.reset(manifest);
   icon_ = icon;
 
   Profile* profile = Profile::FromBrowserContext(
       web_contents()->GetBrowserContext());
 
   ExtensionInstallUI::Prompt prompt(ExtensionInstallUI::INLINE_INSTALL_PROMPT);
   prompt.SetInlineInstallWebstoreData(localized_user_count_,
                                       average_rating_,
                                       rating_count_);
-
-  if (!ShowExtensionInstallDialogForManifest(profile,
-                                             this,
-                                             manifest,
-                                             id_,
-                                             localized_name_,
-                                             localized_description_,
-                                             &icon_,
-                                             prompt,
-                                             &dummy_extension_)) {
-    CompleteInstall(kInvalidManifestError);
+  std::string error;
+  dummy_extension_ = ExtensionInstallUI::GetLocalizedExtensionForDisplay(
+      manifest, id_, localized_name_, localized_description_, &error);
+  if (!dummy_extension_) {
+    OnWebstoreParseFailure(id_, WebstoreInstallHelper::Delegate::MANIFEST_ERROR,
+                           kInvalidManifestError);
     return;
   }
 
+  install_ui_.reset(new ExtensionInstallUI(profile));
+  install_ui_->ConfirmInlineInstall(this, dummy_extension_, &icon_, prompt);
   // Control flow finishes up in InstallUIProceed or InstallUIAbort.
 }
 
 void WebstoreInlineInstaller::OnWebstoreParseFailure(
     const std::string& id,
     InstallHelperResultCode result_code,
     const std::string& error_message) {
   CompleteInstall(error_message);
 }
 
@@ skipping 49 matching lines @@
   if (web_contents()) {
     if (error.empty()) {
       delegate_->OnInlineInstallSuccess(install_id_, return_route_id_);
     } else {
       delegate_->OnInlineInstallFailure(install_id_, return_route_id_, error);
     }
   }
 
   Release(); // Matches the AddRef in BeginInstall.
 }