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

ui/gfx/render_text.cc

 // Copyright (c) 2012 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.h"
 
 #include <limits.h>
 
 #include <algorithm>
 #include <climits>
@@ skipping 614 matching lines @@
     cursor = GetAdjacentSelectionModel(cursor, break_type, direction);
   }
   if (select)
     cursor.set_selection_start(selection().start());
   MoveCursorTo(cursor);
 }
 
 bool RenderText::MoveCursorTo(const SelectionModel& model) {
   // Enforce valid selection model components.
   size_t text_length = text().length();
-  Range range(std::min(model.selection().start(), text_length),
+  Range range(std::min(model.selection().start(),
+                       static_cast<uint32_t>(text_length)),
               std::min(model.caret_pos(), text_length));
   // The current model only supports caret positions at valid cursor indices.
   if (!IsValidCursorIndex(range.start()) || !IsValidCursorIndex(range.end()))
     return false;
   SelectionModel sel(range, model.caret_affinity());
   bool changed = sel != selection_model_;
   SetSelectionModel(sel);
   return changed;
 }
 
 bool RenderText::SelectRange(const Range& range) {
-  Range sel(std::min(range.start(), text().length()),
-            std::min(range.end(), text().length()));
+  uint32_t text_length = static_cast<uint32_t>(text().length());
+  Range sel(std::min(range.start(), text_length),
+            std::min(range.end(), text_length));
   // Allow selection bounds at valid indicies amid multi-character graphemes.
   if (!IsValidLogicalIndex(sel.start()) || !IsValidLogicalIndex(sel.end()))
     return false;
   LogicalCursorDirection affinity =
       (sel.is_reversed() || sel.is_empty()) ? CURSOR_FORWARD : CURSOR_BACKWARD;
   SetSelectionModel(SelectionModel(sel, affinity));
   return true;
 }
 
 bool RenderText::IsPointInSelection(const Point& point) {
@@ skipping 881 matching lines @@
 
   SetDisplayOffset(display_offset_.x() + delta_x);
 }
 
 void RenderText::DrawSelection(Canvas* canvas) {
   for (const Rect& s : GetSubstringBounds(selection()))
     canvas->FillRect(s, selection_background_focused_color_);
 }
 
 }  // namespace gfx