Fix deadcode in an invalid string construction.

extensions/browser/extension_error.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 "extensions/browser/extension_error.h"
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "extensions/common/constants.h"
@@ skipping 39 matching lines @@
       message_(message),
       occurrences_(1u) {
 }
 
 ExtensionError::~ExtensionError() {
 }
 
 std::string ExtensionError::PrintForTest() const {
   return std::string("Extension Error:") +
          "\n  OTR:     " + std::string(from_incognito_ ? "true" : "false") +
-         "\n  Level:   " + base::IntToString(static_cast<int>(level_));
+         "\n  Level:   " + base::IntToString(static_cast<int>(level_)) +
          "\n  Source:  " + base::UTF16ToUTF8(source_) +
          "\n  Message: " + base::UTF16ToUTF8(message_) +
          "\n  ID:      " + extension_id_;
 }
 
 bool ExtensionError::IsEqual(const ExtensionError* rhs) const {
   // We don't check |source_| or |level_| here, since they are constant for
   // manifest errors. Check them in RuntimeError::IsEqualImpl() instead.
   return type_ == rhs->type_ &&
          extension_id_ == rhs->extension_id_ &&
@@ skipping 94 matching lines @@
   // other systems), the source won't match up with the final entry in the stack
   // trace. (For instance, in a browser action error, the source is the page -
   // sometimes the background page - but the error is thrown from the script.)
   // Make the source match the stack trace, since that is more likely the cause
   // of the error.
   if (!stack_trace_.empty() && source_ != stack_trace_[0].source)
     source_ = stack_trace_[0].source;
 }
 
 }  // namespace extensions