some fixes and warning disables in ui/ for building on win x64

ui/base/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_BASE_RANGE_RANGE_H_
 #define UI_BASE_RANGE_RANGE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 47 matching lines @@
 
   // Getters and setters.
   size_t start() const { return start_; }
   void set_start(size_t start) { start_ = start; }
 
   size_t end() const { return end_; }
   void set_end(size_t end) { end_ = end; }
 
   // Returns the absolute value of the length.
   size_t length() const {
-    int length = end() - start();
+    ptrdiff_t length = end() - start();
     return length >= 0 ? length : -length;
   }
 
   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;
 
@@ skipping 26 matching lines @@
   std::string ToString() const;
 
  private:
   size_t start_;
   size_t end_;
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_RANGE_RANGE_H_