Change TextRun's length() and charactersLength() to return an unsigned

third_party/WebKit/Source/platform/fonts/shaping/ShapeCache.h

 /*
  * Copyright (C) 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2015 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 119 matching lines @@
         static const unsigned minimumTableSize = 16;
     };
 
     friend bool operator==(const SmallStringKey&, const SmallStringKey&);
 
 public:
     ShapeCache(): m_weakFactory(this), m_version(0) { }
 
     ShapeCacheEntry* add(const TextRun& run, ShapeCacheEntry entry)
     {
-        if (static_cast<unsigned>(run.length()) > SmallStringKey::capacity())
+        if (run.length() > SmallStringKey::capacity())
             return 0;
 
         return addSlowCase(run, entry);
     }
 
     void clearIfVersionChanged(unsigned version)
     {
         if (version != m_version) {
             clear();
             m_version = version;
@@ skipping 24 matching lines @@
     }
 
     WeakPtr<ShapeCache> weakPtr()
     {
         return m_weakFactory.createWeakPtr();
     }
 
 private:
     ShapeCacheEntry* addSlowCase(const TextRun& run, ShapeCacheEntry entry)
     {
-        int length = run.length();
+        unsigned length = run.length();
         bool isNewEntry;
         ShapeCacheEntry *value;
         if (length == 1) {
             uint32_t key = run[0];
             // All current codepointsin UTF-32 are bewteen 0x0 and 0x10FFFF,
             // as such use bit 32 to indicate direction.
             if (run.direction() == RTL)
                 key |= (1u << 31);
             SingleCharMap::AddResult addResult = m_singleCharMap.add(key, entry);
             isNewEntry = addResult.isNewEntry;
@@ skipping 44 matching lines @@
 inline bool operator==(const ShapeCache::SmallStringKey& a, const ShapeCache::SmallStringKey& b)
 {
     if (a.length() != b.length() || a.direction() != b.direction())
         return false;
     return WTF::equal(a.characters(), b.characters(), a.length());
 }
 
 } // namespace blink
 
 #endif // ShapeCache_h