Add condition attribute for MIME media types from Content-Type header.

chrome/browser/extensions/api/declarative_webrequest/webrequest_constants.cc

 // Copyright (c) 2012 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 "chrome/browser/extensions/api/declarative_webrequest/webrequest_constants.h"
 
 namespace extensions {
 namespace declarative_webrequest_constants {
 
 // Signals to which WebRequestRulesRegistries are registered.
 const char kOnRequest[] = "declarativeWebRequest.onRequest";
 
 // Keys of dictionaries.
 const char kCookieKey[] = "cookie";
+const char kContentTypeKey[] = "contentType";
 const char kDirectionKey[] = "direction";
 const char kDomainKey[] = "domain";
 const char kExpiresKey[] = "expires";
 const char kFilterKey[] ="filter";
 const char kFromKey[] = "from";
 const char kHttpOnlyKey[] = "httpOnly";
 const char kInstanceTypeKey[] = "instanceType";
 const char kLowerPriorityThanKey[] = "lowerPriorityThan";
 const char kMaxAgeKey[] = "maxAge";
 const char kModificationKey[] = "modification";
@@ skipping 28 matching lines @@
     "declarativeWebRequest.RemoveRequestHeader";
 const char kRemoveResponseCookieType[] =
     "declarativeWebRequest.RemoveResponseCookie";
 const char kRemoveResponseHeaderType[] =
     "declarativeWebRequest.RemoveResponseHeader";
 const char kRequestMatcherType[] = "declarativeWebRequest.RequestMatcher";
 const char kSetRequestHeaderType[] = "declarativeWebRequest.SetRequestHeader";
 
 }  // namespace declarative_webrequest_constants
 }  // namespace extensions