Switch gfx::Range to use uint32_t instead of size_t.

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 442 matching lines @@
     while (end_pos < segment.char_range.end()) {
       const SkScalar char_width =
           run.GetGlyphWidthForCharRange(Range(end_pos, end_pos + 1));
       if (width + char_width > available_width_)
         break;
       width += char_width;
       end_pos++;
     }
 
     const size_t valid_end_pos = std::max(
-        segment.char_range.start(), FindValidBoundaryBefore(text_, end_pos));
+        segment.char_range.start(),
+        static_cast<uint32_t>(FindValidBoundaryBefore(text_, end_pos)));
     if (end_pos != valid_end_pos) {
       end_pos = valid_end_pos;
       width = run.GetGlyphWidthForCharRange(
           Range(segment.char_range.start(), end_pos));
     }
 
     // |max_width_| might be smaller than a single character. In this case we
     // need to put at least one character in the line. Note that, we should
     // not separate surrogate pair or combining characters.
     // See RenderTextTest.Multiline_MinWidth for an example.
     if (width == 0 && available_width_ == max_width_) {
-      end_pos = std::min(segment.char_range.end(),
-                         FindValidBoundaryAfter(text_, end_pos + 1));
+      end_pos = std::min(
+          segment.char_range.end(),
+          static_cast<uint32_t>(FindValidBoundaryAfter(text_, end_pos + 1)));
     }
 
     return end_pos;
   }
 
   // Gets the glyph width for |word_range|, and splits the |word| into different
   // segments based on its runs.
   SkScalar GetWordWidth(const Range& word_range,
                         std::vector<internal::LineSegment>* segments) const {
     DCHECK(words_);
@@ skipping 1075 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