Introduce IEImporterTestRegistryOverrider to be able to override the registry for a test and flag t…

chrome/browser/importer/ie_importer.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/importer/ie_importer.h"
 
 #include <ole2.h>
 #include <intshcut.h>
 #include <shlobj.h>
 #include <urlhist.h>
@@ skipping 401 matching lines @@
 
 IEImporter::IEImporter() {
 }
 
 void IEImporter::StartImport(const importer::SourceProfile& source_profile,
                              uint16 items,
                              ImporterBridge* bridge) {
   bridge_ = bridge;
   source_path_ = source_profile.source_path;
 
+  // If there is indication that an override is required, but we fail to set it,
+  // prefer returning early to running the test with whatever is in the real
+  // registry.
+  if (!test_registry_overrider_.StartRegistryOverrideIfNeeded()) {
+    NOTREACHED();
+    return;
+  }
+
   bridge_->NotifyStarted();
 
   if ((items & importer::HOME_PAGE) && !cancelled())
     ImportHomepage();  // Doesn't have a UI item.
   // The order here is important!
   if ((items & importer::HISTORY) && !cancelled()) {
     bridge_->NotifyItemStarted(importer::HISTORY);
     ImportHistory();
     bridge_->NotifyItemEnded(importer::HISTORY);
   }
@@ skipping 452 matching lines @@
   static int version = -1;
   if (version < 0) {
     wchar_t buffer[128];
     DWORD buffer_length = sizeof(buffer);
     base::win::RegKey reg_key(HKEY_LOCAL_MACHINE, kIEVersionKey, KEY_READ);
     LONG result = reg_key.ReadValue(L"Version", buffer, &buffer_length, NULL);
     version = ((result == ERROR_SUCCESS)? _wtoi(buffer) : 0);
   }
   return version;
 }