Move Posix file utils to the base namespace.

BUG=
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Review URL: https://codereview.chromium.org/89523002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237642 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/base/linux_util.cc b/base/linux_util.cc
index 5f9ecd4..f8dd2d00 100644
--- a/base/linux_util.cc
+++ b/base/linux_util.cc
@@ -287,8 +287,7 @@
       continue;
     if (syscall_supported != NULL)
       *syscall_supported = true;
-    bool read_ret =
-        file_util::ReadFromFD(fd, syscall_data.get(), expected_data.length());
+    bool read_ret = ReadFromFD(fd, syscall_data.get(), expected_data.length());
     close(fd);
     if (!read_ret)
       continue;