Replace base::str[n]casecmp with helper functions.

ui/gfx/render_text_harfbuzz.cc

 // Copyright 2014 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 "ui/gfx/render_text_harfbuzz.h"
 
 #include <limits>
 #include <set>
 
 #include "base/i18n/bidi_line_iterator.h"
@@ skipping 510 matching lines @@
 
   // The current RTL run segments, to be applied by |UpdateRTLSegmentRanges()|.
   std::vector<SegmentHandle> rtl_segments_;
 
   DISALLOW_COPY_AND_ASSIGN(HarfBuzzLineBreaker);
 };
 
 // Function object for case insensitive string comparison.
 struct CaseInsensitiveCompare {
   bool operator() (const std::string& a, const std::string& b) const {
-    return base::strncasecmp(a.c_str(), b.c_str(), b.length()) < 0;
+    return base::CompareCaseInsensitiveASCII(a, b) < 0;
   }
 };
 
 }  // namespace
 
 namespace internal {
 
 TextRunHarfBuzz::TextRunHarfBuzz()
     : width(0.0f),
       preceding_run_widths(0.0f),
@@ skipping 983 matching lines @@
   DCHECK(!update_layout_run_list_);
   DCHECK(!update_display_run_list_);
   return text_elided() ? display_run_list_.get() : &layout_run_list_;
 }
 
 const internal::TextRunList* RenderTextHarfBuzz::GetRunList() const {
   return const_cast<RenderTextHarfBuzz*>(this)->GetRunList();
 }
 
 }  // namespace gfx