Revert CompressibleString (and its UMA)

third_party/WebKit/Source/bindings/core/v8/ScriptSourceCode.cpp

 // Copyright 2015 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 "bindings/core/v8/ScriptSourceCode.h"
 
 namespace blink {
 
 ScriptSourceCode::ScriptSourceCode()
     : m_startPosition(TextPosition::minimumPosition())
 {
 }
 
 ScriptSourceCode::ScriptSourceCode(const String& source, const KURL& url, const TextPosition& startPosition)
-    : ScriptSourceCode(CompressibleString(source.impl()), url, startPosition)
-{
-}
-
-ScriptSourceCode::ScriptSourceCode(const CompressibleString& source, const KURL& url, const TextPosition& startPosition)
     : m_source(source)
     , m_url(url)
     , m_startPosition(startPosition)
 {
     treatNullSourceAsEmpty();
     if (!m_url.isEmpty())
         m_url.removeFragmentIdentifier();
 }
 
 ScriptSourceCode::ScriptSourceCode(ScriptResource* resource)
@@ skipping 49 matching lines @@
 void ScriptSourceCode::treatNullSourceAsEmpty()
 {
     // ScriptSourceCode allows for the representation of the null/not-there-really ScriptSourceCode value.
     // Encoded by way of a m_source.isNull() being true, with the nullary constructor to be used to
     // construct such a value.
     //
     // Should the other constructors be passed a null string, that is interpreted as representing
     // the empty script. Consequently, we need to disambiguate between such null string occurrences.
     // Do that by converting the latter case's null strings into empty ones.
     if (m_source.isNull())
-        m_source = CompressibleString();
+        m_source = "";
 }
 
 } // namespace blink