Remove disabling of C4267 in 64-bit gn builds

components/upload_list/upload_list_unittest.cc

 // Copyright 2013 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/upload_list/upload_list.h"
 
 #include <stddef.h>
 
 #include <string>
 
@@ skipping 18 matching lines @@
 class UploadListTest : public testing::Test,
                        public UploadList::Delegate {
  public:
   UploadListTest() : worker_pool_owner_(1, "UploadListTest") {}
 
   void SetUp() override {
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
   }
 
   void WriteUploadLog(const std::string& log_data) {
-    ASSERT_GT(base::WriteFile(log_path(), log_data.c_str(), log_data.size()),
+    ASSERT_GT(base::WriteFile(log_path(), log_data.c_str(),
+                              static_cast<int>(log_data.size())),
               0);
   }
 
   void WaitForUploadList() {
     base::RunLoop run_loop;
     quit_closure_ = run_loop.QuitClosure();
     run_loop.Run();
   }
 
   // UploadList::Delegate:
@@ skipping 229 matching lines @@
     double time_double = uploads[0].upload_time.ToDoubleT();
     EXPECT_STREQ(kTestUploadTime, base::DoubleToString(time_double).c_str());
     EXPECT_STREQ(kTestUploadId, uploads[0].upload_id.c_str());
     EXPECT_STREQ(kTestLocalID, uploads[0].local_id.c_str());
     time_double = uploads[0].capture_time.ToDoubleT();
     EXPECT_STREQ(kTestCaptureTime, base::DoubleToString(time_double).c_str());
   }
 }
 
 }  // namespace