Change the default channel for ExtensionBrowserTests from dev to trunk.

chrome/browser/extensions/extension_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 "chrome/browser/extensions/extension_browsertest.h"
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/file_util.h"
@@ skipping 44 matching lines @@
 using extensions::ExtensionCreator;
 using extensions::FeatureSwitch;
 using extensions::Manifest;
 
 ExtensionBrowserTest::ExtensionBrowserTest()
     : loaded_(false),
       installed_(false),
 #if defined(OS_CHROMEOS)
       set_chromeos_user_(true),
 #endif
-      current_channel_(chrome::VersionInfo::CHANNEL_DEV),
+      // Default channel is STABLE but override with UNKNOWN so that unlaunched
+      // or incomplete APIs can write tests.
+      current_channel_(chrome::VersionInfo::CHANNEL_UNKNOWN),
       override_prompt_for_external_extensions_(
           FeatureSwitch::prompt_for_external_extensions(),
           false),
       profile_(NULL) {
   EXPECT_TRUE(temp_dir_.CreateUniqueTempDir());
 }
 
 ExtensionBrowserTest::~ExtensionBrowserTest() {
 }
 
@@ skipping 530 matching lines @@
   EXPECT_EQ(expected_hosts, num_hosts);
   return host;
 }
 
 std::string ExtensionBrowserTest::ExecuteScriptInBackgroundPage(
     const std::string& extension_id,
     const std::string& script) {
   return extensions::browsertest_util::ExecuteScriptInBackgroundPage(
       profile(), extension_id, script);
 }