Replace "external_install" boolean parameter with explicit enumeration in ExtensionUninstall method.

chrome/browser/sync/test/integration/sync_extension_helper.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/sync/test/integration/sync_extension_helper.h"
 
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/values.h"
@@ skipping 65 matching lines @@
                              false /* no requirement errors */,
                              extensions::NOT_BLACKLISTED,
                              false /* don't wait for idle to install */);
   return extension->id();
 }
 
 void SyncExtensionHelper::UninstallExtension(
     Profile* profile, const std::string& name) {
   ExtensionService::UninstallExtensionHelper(
       extensions::ExtensionSystem::Get(profile)->extension_service(),
-      extensions::id_util::GenerateId(name));
+      extensions::id_util::GenerateId(name),
+      ExtensionService::kUninstallReasonSynch);
 }
 
 std::vector<std::string> SyncExtensionHelper::GetInstalledExtensionNames(
     Profile* profile) const {
   std::vector<std::string> names;
 
   scoped_ptr<const extensions::ExtensionSet> extensions(
       extensions::ExtensionRegistry::Get(profile)
           ->GenerateInstalledExtensionsSet());
   for (extensions::ExtensionSet::const_iterator it = extensions->begin();
@@ skipping 291 matching lines @@
     EXPECT_EQ(expected_id, extension->id());
     return NULL;
   }
   DVLOG(2) << "created extension with name = "
            << name << ", id = " << expected_id;
   (it->second)[name] = extension;
   id_to_name_[expected_id] = name;
   id_to_type_[expected_id] = type;
   return extension;
 }