[Blink>TextEncoder] Removed UTF-16 support from TextEncoder API.

third_party/WebKit/Source/modules/encoding/TextEncoder.cpp

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "modules/encoding/TextEncoder.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "core/dom/ExecutionContext.h"
-#include "core/frame/UseCounter.h"
 #include "modules/encoding/Encoding.h"
 #include "wtf/text/CString.h"
 #include "wtf/text/TextEncodingRegistry.h"
 
 namespace blink {
 
-TextEncoder* TextEncoder::create(ExecutionContext* context, const String& utfLabel, ExceptionState& exceptionState)
+TextEncoder* TextEncoder::create(ExecutionContext* context, ExceptionState& exceptionState)
 {
-    WTF::TextEncoding encoding(utfLabel.stripWhiteSpace(&Encoding::isASCIIWhiteSpace));
-    if (!encoding.isValid()) {
-        exceptionState.throwRangeError("The encoding label provided ('" + utfLabel + "') is invalid.");
-        return 0;
-    }
-
-    String name(encoding.name());
-    if (name != "UTF-8" && name != "UTF-16LE" && name != "UTF-16BE") {
-        exceptionState.throwRangeError("The encoding provided ('" + utfLabel + "') is not one of 'utf-8', 'utf-16', or 'utf-16be'.");
-        return 0;
-    }
-
-    if (name == "UTF-16LE" || name == "UTF-16BE")
-        UseCounter::count(context, UseCounter::TextEncoderUTF16);
-
+    WTF::TextEncoding encoding("UTF-8");
     return new TextEncoder(encoding);
 }
 
 TextEncoder::TextEncoder(const WTF::TextEncoding& encoding)
     : m_encoding(encoding)
     , m_codec(newTextCodec(encoding))
 {
+    String name(m_encoding.name());
+    DCHECK_EQ(name, "UTF-8");
 }
 
 TextEncoder::~TextEncoder()
 {
 }
 
 String TextEncoder::encoding() const
 {
     String name = String(m_encoding.name()).lower();
-    ASSERT(name == "utf-8" || name == "utf-16le" || name == "utf-16be");
+    DCHECK_EQ(name, "utf-8");
     return name;
 }
 
 DOMUint8Array* TextEncoder::encode(const String& input)
 {
     CString result;
     if (input.is8Bit())
         result = m_codec->encode(input.characters8(), input.length(), WTF::QuestionMarksForUnencodables);
     else
         result = m_codec->encode(input.characters16(), input.length(), WTF::QuestionMarksForUnencodables);
 
     const char* buffer = result.data();
     const unsigned char* unsignedBuffer = reinterpret_cast<const unsigned char*>(buffer);
 
     return DOMUint8Array::create(unsignedBuffer, result.length());
 }
 
 } // namespace blink