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

third_party/WebKit/Source/platform/fonts/shaping/ShapeResultBuffer.cpp

 // Copyright 2016 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 "platform/fonts/shaping/ShapeResultBuffer.h"
 
 #include "platform/fonts/CharacterRange.h"
 #include "platform/fonts/GlyphBuffer.h"
 #include "platform/fonts/SimpleFontData.h"
 #include "platform/fonts/shaping/ShapeResultInlineHeaders.h"
@@ skipping 187 matching lines @@
 
     ASSERT(!glyphBuffer->hasVerticalOffsets());
 
     return advance;
 }
 
 float ShapeResultBuffer::fillGlyphBuffer(GlyphBuffer* glyphBuffer, const TextRun& textRun,
     unsigned from, unsigned to) const
 {
     // Fast path: full run with no vertical offsets
-    if (!from && to == static_cast<unsigned>(textRun.length()) && !hasVerticalOffsets())
+    if (!from && to == textRun.length() && !hasVerticalOffsets())
         return fillFastHorizontalGlyphBuffer(glyphBuffer, textRun.direction());
 
     float advance = 0;
 
     if (textRun.rtl()) {
         unsigned wordOffset = textRun.length();
         for (unsigned j = 0; j < m_results.size(); j++) {
             unsigned resolvedIndex = m_results.size() - 1 - j;
             const RefPtr<const ShapeResult>& wordResult = m_results[resolvedIndex];
             for (unsigned i = 0; i < wordResult->m_runs.size(); i++) {
@@ skipping 186 matching lines @@
             totalOffset += offsetForWord;
             if (targetX >= 0 && targetX <= wordResult->width())
                 return totalOffset;
             targetX -= wordResult->width();
         }
     }
     return totalOffset;
 }
 
 } // namespace blink