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

media/blink/buffered_resource_loader.cc

 // Copyright 2013 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 "media/blink/buffered_resource_loader.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <limits>
 #include <utility>
@@ skipping 710 matching lines @@
   return first_byte_position_;
 }
 
 // static
 bool BufferedResourceLoader::ParseContentRange(
     const std::string& content_range_str,
     int64_t* first_byte_position,
     int64_t* last_byte_position,
     int64_t* instance_size) {
   const std::string kUpThroughBytesUnit = "bytes ";
-  if (content_range_str.find(kUpThroughBytesUnit) != 0)
+  if (!base::StartsWith(content_range_str, kUpThroughBytesUnit,
+                        base::CompareCase::SENSITIVE)) {
     return false;
+  }
   std::string range_spec =
       content_range_str.substr(kUpThroughBytesUnit.length());
   size_t dash_offset = range_spec.find("-");
   size_t slash_offset = range_spec.find("/");
 
   if (dash_offset == std::string::npos || slash_offset == std::string::npos ||
       slash_offset < dash_offset || slash_offset + 1 == range_spec.length()) {
     return false;
   }
   if (!base::StringToInt64(range_spec.substr(0, dash_offset),
@@ skipping 80 matching lines @@
 
 void BufferedResourceLoader::Log() {
   media_log_->AddEvent(
       media_log_->CreateBufferedExtentsChangedEvent(
           offset_ - buffer_.backward_bytes(),
           offset_,
           offset_ + buffer_.forward_bytes()));
 }
 
 }  // namespace media