sync: don't allow NULL profile in ProfileSyncService and friends

chrome/browser/extensions/api/signed_in_devices/signed_in_devices_api_unittest.cc

Index: chrome/browser/extensions/api/signed_in_devices/signed_in_devices_api_unittest.cc
diff --git a/chrome/browser/extensions/api/signed_in_devices/signed_in_devices_api_unittest.cc b/chrome/browser/extensions/api/signed_in_devices/signed_in_devices_api_unittest.cc
index 838fc6a82deb14eef01d277563d569546737d9f9..580100ddbdd2ead185b40323593a144ea10586dd 100644
--- a/chrome/browser/extensions/api/signed_in_devices/signed_in_devices_api_unittest.cc
+++ b/chrome/browser/extensions/api/signed_in_devices/signed_in_devices_api_unittest.cc
@@ -31,7 +31,8 @@ namespace extensions {
 namespace utils = extension_function_test_utils;
 
 TEST(SignedInDevicesAPITest, GetSignedInDevices) {
-  ProfileSyncServiceMock pss_mock;
+  TestingProfile profile;
+  ProfileSyncServiceMock pss_mock(&profile);
   base::MessageLoop message_loop_;
   TestExtensionPrefs extension_prefs(
       message_loop_.message_loop_proxy().get());
@@ -107,14 +108,17 @@ TEST(SignedInDevicesAPITest, GetSignedInDevices) {
 class ProfileSyncServiceMockForExtensionTests:
     public ProfileSyncServiceMock {
  public:
-  ProfileSyncServiceMockForExtensionTests() {}
+  explicit ProfileSyncServiceMockForExtensionTests(Profile* p)
+      : ProfileSyncServiceMock(p) {}
   ~ProfileSyncServiceMockForExtensionTests() {}
+
   MOCK_METHOD0(Shutdown, void());
 };
 
 BrowserContextKeyedService* CreateProfileSyncServiceMock(
     content::BrowserContext* profile) {
-  return new ProfileSyncServiceMockForExtensionTests();
+  return new ProfileSyncServiceMockForExtensionTests(
+      Profile::FromBrowserContext(profile));
 }
 
 class ExtensionSignedInDevicesTest : public BrowserWithTestWindowTest {