Make UTF16ToASCII and UTF16TOUTF8 take a StringPiece

media/blink/webcontentdecryptionmodulesession_impl.cc

 // Copyright 2013 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 "webcontentdecryptionmodulesession_impl.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/logging.h"
 #include "base/numerics/safe_conversions.h"
@@ skipping 147 matching lines @@
 }
 
 static bool SanitizeSessionId(const blink::WebString& session_id,
                               std::string* sanitized_session_id) {
   // The user agent should thoroughly validate the sessionId value before
   // passing it to the CDM. At a minimum, this should include checking that
   // the length and value (e.g. alphanumeric) are reasonable.
   if (!base::IsStringASCII(session_id))
     return false;
 
-  sanitized_session_id->assign(base::UTF16ToASCII(session_id));
+  sanitized_session_id->assign(
+      base::UTF16ToASCII(base::StringPiece16(session_id)));
   if (sanitized_session_id->length() > limits::kMaxSessionIdLength)
     return false;
 
   for (const char c : *sanitized_session_id) {
     if (!base::IsAsciiAlpha(c) && !base::IsAsciiDigit(c))
       return false;
   }
 
   return true;
 }
@@ skipping 237 matching lines @@
     return blink::WebContentDecryptionModuleResult::SessionNotFound;
 
   DCHECK(session_id_.empty()) << "Session ID may not be changed once set.";
   session_id_ = session_id;
   return adapter_->RegisterSession(session_id_, weak_ptr_factory_.GetWeakPtr())
              ? blink::WebContentDecryptionModuleResult::NewSession
              : blink::WebContentDecryptionModuleResult::SessionAlreadyExists;
 }
 
 }  // namespace media