Make UTF16ToASCII and UTF16TOUTF8 take a StringPiece

media/blink/encrypted_media_player_support.cc

 // Copyright 2014 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 "media/blink/encrypted_media_player_support.h"
 
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/metrics/histogram.h"
@@ skipping 20 matching lines @@
 
 #define BIND_TO_RENDER_LOOP1(function, arg1)     \
   (BindToCurrentLoop(base::Bind(function, AsWeakPtr(), arg1)))
 
 // Prefix for histograms related to Encrypted Media Extensions.
 static const char* kMediaEme = "Media.EME.";
 
 // Convert a WebString to ASCII, falling back on an empty string in the case
 // of a non-ASCII string.
 static std::string ToASCIIOrEmpty(const WebString& string) {
-  return base::IsStringASCII(string) ? base::UTF16ToASCII(string)
-                                     : std::string();
+  return base::IsStringASCII(string)
+      ? base::UTF16ToASCII(base::StringPiece16(string))
+      : std::string();
 }
 
 // Helper functions to report media EME related stats to UMA. They follow the
 // convention of more commonly used macros UMA_HISTOGRAM_ENUMERATION and
 // UMA_HISTOGRAM_COUNTS. The reason that we cannot use those macros directly is
 // that UMA_* macros require the names to be constant throughout the process'
 // lifetime.
 static void EmeUMAHistogramEnumeration(const std::string& key_system,
                                        const std::string& method,
                                        int sample,
@@ skipping 265 matching lines @@
 
   client_->keyMessage(
       WebString::fromUTF8(GetPrefixedKeySystemName(current_key_system_)),
       WebString::fromUTF8(session_id),
       message.empty() ? NULL : &message[0],
       base::saturated_cast<unsigned int>(message.size()),
       destination_url);
 }
 
 }  // namespace media