base/files: Fixed two minor lint warnings.

base/files/file_util_posix.cc

Index: base/files/file_util_posix.cc
diff --git a/base/files/file_util_posix.cc b/base/files/file_util_posix.cc
index b8c0eeb94c0088d07aa41f7e4e7bf593ea72094d..0bf41a52351a2e14d643a575ac8328dd478aa21a 100644
--- a/base/files/file_util_posix.cc
+++ b/base/files/file_util_posix.cc
@@ -28,8 +28,6 @@
 #include <glib.h>  // for g_get_home_dir()
 #endif
 
-#include <fstream>
-
 #include "base/basictypes.h"
 #include "base/files/file_enumerator.h"
 #include "base/files/file_path.h"
@@ -428,7 +426,7 @@ bool GetPosixFilePermissions(const FilePath& path, int* mode) {
 bool SetPosixFilePermissions(const FilePath& path,
                              int mode) {
   ThreadRestrictions::AssertIOAllowed();
-  DCHECK((mode & ~FILE_PERMISSION_MASK) == 0);
+  DCHECK_EQ(mode & ~FILE_PERMISSION_MASK, 0);
 
   // Calls stat() so that we can preserve the higher bits like S_ISGID.
   stat_wrapper_t stat_buf;