Remove legacy StartsWithASCII function.

tools/gn/target.cc

 // Copyright (c) 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 "tools/gn/target.h"
 
 #include "base/bind.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "tools/gn/config_values_extractors.h"
@@ skipping 201 matching lines @@
       << "Toolchain must be specified before getting the computed output name.";
 
   const std::string& name = output_name_.empty() ? label().name()
                                                  : output_name_;
 
   std::string result;
   if (include_prefix) {
     const Tool* tool = toolchain_->GetToolForTargetFinalOutput(this);
     if (tool) {
       // Only add the prefix if the name doesn't already have it.
-      if (!base::StartsWithASCII(name, tool->output_prefix(), true))
+      if (!base::StartsWith(name, tool->output_prefix(),
+                            base::CompareCase::SENSITIVE))
         result = tool->output_prefix();
     }
   }
   result.append(name);
   return result;
 }
 
 bool Target::SetToolchain(const Toolchain* toolchain, Err* err) {
   DCHECK(!toolchain_);
   DCHECK_NE(UNKNOWN, output_type_);
@@ skipping 320 matching lines @@
     return;  // Not in output dir, this is OK.
 
   // Tell the scheduler about unknown files. This will be noted for later so
   // the list of files written by the GN build itself (often response files)
   // can be filtered out of this list.
   OutputFile out_file(settings()->build_settings(), source);
   std::set<const Target*> seen_targets;
   if (!EnsureFileIsGeneratedByDependency(this, out_file, true, &seen_targets))
     g_scheduler->AddUnknownGeneratedInput(this, source);
 }