Remove all the browser side extensions code from Android.

chrome/test/base/testing_profile.cc

Index: chrome/test/base/testing_profile.cc
diff --git a/chrome/test/base/testing_profile.cc b/chrome/test/base/testing_profile.cc
index d49df37d25c58acc61a6d9a838facc2c1b7bd1f9..72f1e80b7b13ed31f89f5080308e4d0a89ac0caf 100644
--- a/chrome/test/base/testing_profile.cc
+++ b/chrome/test/base/testing_profile.cc
@@ -19,8 +19,6 @@
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/content_settings/host_content_settings_map.h"
-#include "chrome/browser/extensions/extension_system_factory.h"
-#include "chrome/browser/extensions/test_extension_system.h"
 #include "chrome/browser/favicon/chrome_favicon_client_factory.h"
 #include "chrome/browser/favicon/favicon_service.h"
 #include "chrome/browser/favicon/favicon_service_factory.h"
@@ -84,6 +82,8 @@
 
 #if defined(ENABLE_EXTENSIONS)
 #include "chrome/browser/extensions/extension_special_storage_policy.h"
+#include "chrome/browser/extensions/extension_system_factory.h"
+#include "chrome/browser/extensions/test_extension_system.h"
 #include "chrome/browser/guest_view/guest_view_manager.h"
 #include "extensions/browser/extension_system.h"
 #endif
@@ -354,8 +354,10 @@ void TestingProfile::Init() {
   if (!IsOffTheRecord())
     CreateProfilePolicyConnector();
 
+#if defined(ENABLE_EXTENSIONS)
   extensions::ExtensionSystemFactory::GetInstance()->SetTestingFactory(
       this, extensions::TestExtensionSystem::Build);
+#endif
 
   // If no original profile was specified for this profile: register preferences
   // even if this is an incognito profile - this allows tests to create a