Convert ManifestManager IPCs to Mojo.

content/renderer/manifest/manifest_parser.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 "content/renderer/manifest/manifest_parser.h"
 
 #include <stddef.h>
 
 #include "base/json/json_reader.h"
 #include "base/memory/ptr_util.h"
@@ skipping 167 matching lines @@
 
   base::string16 value;
   if (!dictionary.GetString(key, &value)) {
     AddErrorInfo("property '" + key + "' ignored, type " +
                  "string expected.");
     return base::NullableString16();
   }
 
   if (trim == Trim)
     base::TrimWhitespace(value, base::TRIM_ALL, &value);
-  return base::NullableString16(value, false);
+  return base::NullableString16(
+      value.substr(0, content::Manifest::kMaxIPCStringLength), false);
 }
 
 int64_t ManifestParser::ParseColor(
     const base::DictionaryValue& dictionary,
     const std::string& key) {
   base::NullableString16 parsed_color = ParseString(dictionary, key, Trim);
   if (parsed_color.is_null())
     return Manifest::kInvalidOrMissingColor;
 
   blink::WebColor color;
@@ skipping 235 matching lines @@
 }
 
 void ManifestParser::AddErrorInfo(const std::string& error_msg,
                                   bool critical,
                                   int error_line,
                                   int error_column) {
   errors_.push_back({error_msg, critical, error_line, error_column});
 }
 
 } // namespace content