Force the channel to be dev for active tab and manfiest unit tests.

chrome/browser/extensions/active_tab_unittest.cc

Index: chrome/browser/extensions/active_tab_unittest.cc
diff --git a/chrome/browser/extensions/active_tab_unittest.cc b/chrome/browser/extensions/active_tab_unittest.cc
index 8d89be6effcd11b81fa9efa80ff55f2334252a7d..1cee2f9c5d1a8e013ed32205dfdc1cc58606fd5f 100644
--- a/chrome/browser/extensions/active_tab_unittest.cc
+++ b/chrome/browser/extensions/active_tab_unittest.cc
@@ -55,11 +55,11 @@ scoped_refptr<const Extension> CreateTestExtension(
 class ActiveTabTest : public TabContentsTestHarness {
  public:
   ActiveTabTest()
-      : extension(CreateTestExtension("deadbeef", true)),
+      : current_channel_(chrome::VersionInfo::CHANNEL_DEV),
+        extension(CreateTestExtension("deadbeef", true)),
         another_extension(CreateTestExtension("feedbeef", true)),
         extension_without_active_tab(CreateTestExtension("badbeef", false)),
-        ui_thread_(BrowserThread::UI, MessageLoop::current()),
-        current_channel_(chrome::VersionInfo::CHANNEL_DEV) {}
+        ui_thread_(BrowserThread::UI, MessageLoop::current()) {}
 
  protected:
   int tab_id() {
@@ -106,6 +106,11 @@ class ActiveTabTest : public TabContentsTestHarness {
     return extension->HasAPIPermissionForTab(tab_id, APIPermission::kTab);
   }
 
+  // Force the test to run in dev channel because the permission is only
+  // available in dev channel. Without declaring this first, the extensions
+  // below won't load due to manifest errors.
+  Feature::ScopedCurrentChannel current_channel_;
+
   // An extension with the activeTab permission.
   scoped_refptr<const Extension> extension;
 
@@ -117,7 +122,6 @@ class ActiveTabTest : public TabContentsTestHarness {
 
  private:
   content::TestBrowserThread ui_thread_;
-  Feature::ScopedCurrentChannel current_channel_;
 };
 
 TEST_F(ActiveTabTest, GrantToSinglePage) {