Remove base's implicit_cast.

base/files/file_unittest.cc

 // Copyright (c) 2012 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 "base/files/file.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 499 matching lines @@
   EXPECT_EQ(0, info.size);
 }
 #endif  // defined(OS_WIN)
 
 #if defined(OS_POSIX) && defined(GTEST_HAS_DEATH_TEST)
 TEST(FileTest, MemoryCorruption) {
   {
     // Test that changing the checksum value is detected.
     base::File file;
     EXPECT_NE(file.file_.file_memory_checksum_,
-              implicit_cast<unsigned int>(file.GetPlatformFile()));
+              static_cast<unsigned int>(file.GetPlatformFile()));
     file.file_.file_memory_checksum_ = file.GetPlatformFile();
     EXPECT_DEATH(file.IsValid(), "");
 
     file.file_.UpdateChecksum();  // Do not crash on File::~File().
   }
 
   {
     // Test that changing the file descriptor value is detected.
     base::File file;
     file.file_.file_.reset(17);
@@ skipping 40 matching lines @@
     EXPECT_DEATH(file.Seek(File::FROM_BEGIN, 0), "");
     EXPECT_DEATH(file.Read(0, NULL, 0), "");
     EXPECT_DEATH(file.ReadAtCurrentPos(NULL, 0), "");
     EXPECT_DEATH(file.Write(0, NULL, 0), "");
 
     ignore_result(file.file_.file_.release());
     file.file_.UpdateChecksum();
   }
 }
 #endif  // defined(OS_POSIX)