Cleanup dead code in base/ as found by Scythe.

base/files/file_util_proxy_unittest.cc

Index: base/files/file_util_proxy_unittest.cc
diff --git a/base/files/file_util_proxy_unittest.cc b/base/files/file_util_proxy_unittest.cc
index 17bbba83fa2baf2c421f177eacac1776b3ade87a..5eb68193687234b6a302fa8fd23718e0e784dd15 100644
--- a/base/files/file_util_proxy_unittest.cc
+++ b/base/files/file_util_proxy_unittest.cc
@@ -19,8 +19,6 @@ class FileUtilProxyTest : public testing::Test {
   FileUtilProxyTest()
       : file_thread_("FileUtilProxyTestFileThread"),
         error_(File::FILE_OK),
-        created_(false),
-        bytes_written_(-1),
         weak_factory_(this) {}
 
   void SetUp() override {
@@ -52,11 +50,9 @@ class FileUtilProxyTest : public testing::Test {
 
   ScopedTempDir dir_;
   File::Error error_;
-  bool created_;
   FilePath path_;
   File::Info file_info_;
   std::vector<char> buffer_;
-  int bytes_written_;
   WeakPtrFactory<FileUtilProxyTest> weak_factory_;
 };