Fix incorrect usage of StringImpl::sizeInBytes.

third_party/WebKit/Source/wtf/text/WTFString.h

Index: third_party/WebKit/Source/wtf/text/WTFString.h
diff --git a/third_party/WebKit/Source/wtf/text/WTFString.h b/third_party/WebKit/Source/wtf/text/WTFString.h
index b5aa5a9e77976542ac08e096b0bf066d3a7e9499..92f1e4f3631e7f10b990366a967c5fab8aa24d98 100644
--- a/third_party/WebKit/Source/wtf/text/WTFString.h
+++ b/third_party/WebKit/Source/wtf/text/WTFString.h
@@ -138,13 +138,6 @@ public:
 
     bool is8Bit() const { return m_impl->is8Bit(); }
 
-    unsigned sizeInBytes() const
-    {
-        if (!m_impl)
-            return 0;
-        return m_impl->length() * (is8Bit() ? sizeof(LChar) : sizeof(UChar));
-    }
-
     CString ascii() const;
     CString latin1() const;
     CString utf8(UTF8ConversionMode = LenientUTF8Conversion) const;
@@ -376,6 +369,8 @@ public:
     bool containsOnlyLatin1() const;
     bool containsOnlyWhitespace() const { return !m_impl || m_impl->containsOnlyWhitespace(); }
 
+    size_t charactersSizeInBytes() const { return m_impl ? m_impl->charactersSizeInBytes() : 0; }
+
     // Hash table deleted values, which are only constructed and never copied or
     // destroyed.
     String(WTF::HashTableDeletedValueType) : m_impl(WTF::HashTableDeletedValue) { }