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

ui/gfx/range/range.h

 // 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.
 
 #ifndef UI_GFX_RANGE_RANGE_H_
 #define UI_GFX_RANGE_RANGE_H_
 
 #include <stddef.h>
+#include <stdint.h>
 
 #include <ostream>
 #include <string>
 
 #include "build/build_config.h"
 #include "ui/gfx/gfx_export.h"
 
 #if defined(OS_MACOSX)
 #if __OBJC__
 #import <Foundation/Foundation.h>
@@ skipping 13 matching lines @@
 // range of characters in a text selection. A range is made of a start and end
 // position; when they are the same, the Range is akin to a caret. Note that
 // |start_| can be greater than |end_| to respect the directionality of the
 // range.
 class GFX_EXPORT Range {
  public:
   // Creates an empty range {0,0}.
   Range();
 
   // Initializes the range with a start and end.
-  Range(size_t start, size_t end);
+  Range(uint32_t start, uint32_t end);
 
   // Initializes the range with the same start and end positions.
-  explicit Range(size_t position);
+  explicit Range(uint32_t position);
 
   // Platform constructors.
 #if defined(OS_MACOSX)
   explicit Range(const NSRange& range);
 #elif defined(OS_WIN)
   // The |total_length| paramater should be used if the CHARRANGE is set to
   // {0,-1} to indicate the whole range.
   Range(const CHARRANGE& range, LONG total_length = -1);
 #endif
 
-  // Returns a range that is invalid, which is {size_t_max,size_t_max}.
+  // Returns a range that is invalid, which is {UINT32_MAX,UINT32_MAX}.
   static const Range InvalidRange();
 
   // Checks if the range is valid through comparison to InvalidRange().
   bool IsValid() const;
 
   // Getters and setters.
-  size_t start() const { return start_; }
-  void set_start(size_t start) { start_ = start; }
+  uint32_t start() const { return start_; }
+  void set_start(uint32_t start) { start_ = start; }
 
-  size_t end() const { return end_; }
-  void set_end(size_t end) { end_ = end; }
+  uint32_t end() const { return end_; }
+  void set_end(uint32_t end) { end_ = end; }
 
   // Returns the absolute value of the length.
-  size_t length() const {
-    ptrdiff_t length = end() - start();
-    return length >= 0 ? length : -length;
+  uint32_t length() const {
+    return GetMax() - GetMin();
   }
 
   bool is_reversed() const { return start() > end(); }
   bool is_empty() const { return start() == end(); }
 
   // Returns the minimum and maximum values.
-  size_t GetMin() const;
-  size_t GetMax() const;
+  uint32_t GetMin() const;
+  uint32_t GetMax() const;
 
   bool operator==(const Range& other) const;
   bool operator!=(const Range& other) const;
   bool EqualsIgnoringDirection(const Range& other) const;
 
   // Returns true if this range intersects the specified |range|.
   bool Intersects(const Range& range) const;
 
   // Returns true if this range contains the specified |range|.
   bool Contains(const Range& range) const;
@@ skipping 10 matching lines @@
   // is_reversed(), the range will get flipped when converted to an NSRange.
   NSRange ToNSRange() const;
 #elif defined(OS_WIN)
   CHARRANGE ToCHARRANGE() const;
 #endif
   // GTK+ has no concept of a range.
 
   std::string ToString() const;
 
  private:
-  size_t start_;
-  size_t end_;
+  uint32_t start_;
+  uint32_t end_;
 };
 
 GFX_EXPORT std::ostream& operator<<(std::ostream& os, const Range& range);
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RANGE_RANGE_H_