Reland of place string::find(prefix) == 0 pattern with base::StartsWith().

components/leveldb/env_mojo.cc

 // Copyright 2016 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/leveldb/env_mojo.h"
 
 #include <errno.h>
 
 #include <memory>
 
+#include "base/strings/string_util.h"
 #include "base/trace_event/trace_event.h"
 #include "third_party/leveldatabase/chromium_logger.h"
 #include "third_party/leveldatabase/src/include/leveldb/status.h"
 
 namespace leveldb {
 
 namespace {
 
 const base::FilePath::CharType table_extension[] = FILE_PATH_LITERAL(".ldb");
 
@@ skipping 109 matching lines @@
   MojoWritableFile(LevelDBMojoProxy::OpaqueDir* dir,
                    const std::string& fname,
                    base::File f,
                    scoped_refptr<LevelDBMojoProxy> thread)
       : filename_(fname),
         file_(std::move(f)),
         file_type_(kOther),
         dir_(dir),
         thread_(thread) {
     base::FilePath path = base::FilePath::FromUTF8Unsafe(fname);
-    if (path.BaseName().AsUTF8Unsafe().find("MANIFEST") == 0)
+    if (base::StartsWith(path.BaseName().AsUTF8Unsafe(), "MANIFEST",
+                         base::CompareCase::SENSITIVE)) {
       file_type_ = kManifest;
-    else if (path.MatchesExtension(table_extension))
+    } else if (path.MatchesExtension(table_extension)) {
       file_type_ = kTable;
+    }
     parent_dir_ =
         base::FilePath::FromUTF8Unsafe(fname).DirName().AsUTF8Unsafe();
   }
 
   ~MojoWritableFile() override {}
 
   leveldb::Status Append(const leveldb::Slice& data) override {
     size_t bytes_written = file_.WriteAtCurrentPos(
         data.data(), static_cast<int>(data.size()));
     if (bytes_written != data.size()) {
@@ skipping 218 matching lines @@
     *result = NULL;
     return MakeIOError(fname, "Unable to create log file",
                        leveldb_env::kNewLogger, f->error_details());
   } else {
     *result = new leveldb::ChromiumLogger(f.release());
     return Status::OK();
   }
 }
 
 }  // namespace leveldb