Disable off-store extension installs by default.

chrome/browser/extensions/crx_installer_browsertest.cc

Index: chrome/browser/extensions/crx_installer_browsertest.cc
diff --git a/chrome/browser/extensions/crx_installer_browsertest.cc b/chrome/browser/extensions/crx_installer_browsertest.cc
index a98560e43ca70553a344bec30928907d10229ced..00a1a4f1aa97a5cee452b45e284a300b897d545e 100644
--- a/chrome/browser/extensions/crx_installer_browsertest.cc
+++ b/chrome/browser/extensions/crx_installer_browsertest.cc
@@ -14,6 +14,7 @@
 #include "chrome/browser/ui/browser.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension_file_util.h"
+#include "chrome/common/extensions/extension_switch_utils.h"
 #include "chrome/test/base/ui_test_utils.h"
 
 class SkBitmap;
@@ -124,6 +125,9 @@ IN_PROC_BROWSER_TEST_F(ExtensionCrxInstallerTest, PlatformAppCrx) {
 }
 
 IN_PROC_BROWSER_TEST_F(ExtensionCrxInstallerTest, PackAndInstallExtension) {
+  if (!extensions::switch_utils::IsOffStoreInstallEnabled())
+    return;
+
   const int kNumDownloadsExpected = 1;
   const bool kExpectFileSelectDialog = false;