Fix AccountInfo uninitialized memory issues.

components/signin/core/browser/account_info_unittest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/signin/core/browser/account_info.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 class AccountInfoTest : public testing::Test {};
 
 // Tests that IsValid() returns true only when all the fields are non-empty.
@@ skipping 39 matching lines @@
   other.gaia = other.email = "test_other_id";
   other.is_child_account = false;
 
   EXPECT_FALSE(info.UpdateWith(other));
   EXPECT_EQ("test_id", info.gaia);
   EXPECT_EQ("test_id", info.email);
   EXPECT_TRUE(info.is_child_account);
 }
 
 // Tests that UpdateWith() correctly updates its fields that were not set.
-// Fails under MSan. crbug.com/577333
-#if defined(MEMORY_SANITIZER)
-#define MAYBE_UpdateWithSuccessfulUpdate DISABLED_UpdateWithSuccessfulUpdate
-#else
-#define MAYBE_UpdateWithSuccessfulUpdate UpdateWithSuccessfulUpdate
-#endif
-TEST_F(AccountInfoTest, MAYBE_UpdateWithSuccessfulUpdate) {
+TEST_F(AccountInfoTest, UpdateWithSuccessfulUpdate) {
   AccountInfo info;
   info.account_id = info.gaia = info.email = "test_id";
 
   AccountInfo other;
   other.account_id = "test_id";
   other.full_name = other.given_name = "test_name";
   other.is_child_account = true;
 
   EXPECT_TRUE(info.UpdateWith(other));
   EXPECT_EQ("test_id", info.gaia);
   EXPECT_EQ("test_id", info.email);
   EXPECT_EQ("test_name", info.full_name);
   EXPECT_EQ("test_name", info.given_name);
   EXPECT_TRUE(info.is_child_account);
 }