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

base/trace_event/trace_config.cc

 // Copyright (c) 2015 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/trace_event/trace_config.h"
 
 #include <stddef.h>
 
 #include <utility>
 
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/pattern.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_tokenizer.h"
+#include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/memory_dump_manager.h"
 #include "base/trace_event/memory_dump_request_args.h"
 #include "base/trace_event/trace_event.h"
 
 namespace base {
 namespace trace_event {
 
 namespace {
 
@@ skipping 377 matching lines @@
     std::vector<std::string> split = base::SplitString(
         category_filter_string, ",", base::TRIM_WHITESPACE,
         base::SPLIT_WANT_ALL);
     std::vector<std::string>::iterator iter;
     for (iter = split.begin(); iter != split.end(); ++iter) {
       std::string category = *iter;
       // Ignore empty categories.
       if (category.empty())
         continue;
       // Synthetic delays are of the form 'DELAY(delay;option;option;...)'.
-      if (category.find(kSyntheticDelayCategoryFilterPrefix) == 0 &&
+      if (base::StartsWith(category, kSyntheticDelayCategoryFilterPrefix,
+                           base::CompareCase::SENSITIVE) &&
           category.at(category.size() - 1) == ')') {
         category = category.substr(
             strlen(kSyntheticDelayCategoryFilterPrefix),
             category.size() - strlen(kSyntheticDelayCategoryFilterPrefix) - 1);
         size_t name_length = category.find(';');
         if (name_length != std::string::npos && name_length > 0 &&
             name_length != category.size() - 1) {
           synthetic_delays_.push_back(category);
         }
       } else if (category.at(0) == '-') {
@@ skipping 335 matching lines @@
           str.at(0) == ' ' ||
           str.at(str.length() - 1) == ' ';
 }
 
 bool TraceConfig::HasIncludedPatterns() const {
   return !included_categories_.empty();
 }
 
 }  // namespace trace_event
 }  // namespace base