Use only IJG decoding path to decode profile pictures on login screen

chrome/browser/chromeos/login/user_image_manager_browsertest.cc

Index: chrome/browser/chromeos/login/user_image_manager_browsertest.cc
diff --git a/chrome/browser/chromeos/login/user_image_manager_browsertest.cc b/chrome/browser/chromeos/login/user_image_manager_browsertest.cc
index acc74f912c87c9e14b3e4de4247c5d9a1c5dd834..e46ef5c4723c12bdd8cd43de83467c8a82006751 100644
--- a/chrome/browser/chromeos/login/user_image_manager_browsertest.cc
+++ b/chrome/browser/chromeos/login/user_image_manager_browsertest.cc
@@ -232,13 +232,15 @@ IN_PROC_BROWSER_TEST_F(UserImageManagerTest, PRE_NonJPEGImageFromFile) {
   // Old info preserved.
   ExpectOldUserImageInfo(kTestUser1, User::kExternalImageIndex,
                          GetUserImagePath(kTestUser1, "png"));
+  const User* user = UserManager::Get()->FindUser(kTestUser1);
+  EXPECT_TRUE(user->image_is_stub());
   LogIn(kTestUser1);
   // Wait for migration.
   content::RunMessageLoop();
   // Image info is migrated and the image is converted to JPG.
   ExpectNewUserImageInfo(kTestUser1, User::kExternalImageIndex,
                          GetUserImagePath(kTestUser1, "jpg"));
-  const User* user = UserManager::Get()->GetLoggedInUser();
+  user = UserManager::Get()->GetLoggedInUser();
   ASSERT_TRUE(user);
   EXPECT_FALSE(user->image_is_safe_format());
   // Check image dimensions.