Moving capture_web_contents_function to extensions.

extensions/common/constants.h

 // 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.
 
 #ifndef EXTENSIONS_COMMON_CONSTANTS_H_
 #define EXTENSIONS_COMMON_CONSTANTS_H_
 
 #include "base/basictypes.h"
 #include "base/files/file_path.h"
 #include "ui/base/layout.h"
@@ skipping 83 matching lines @@
 // extension state resides.
 extern const char kStateStoreName[];
 
 // The name of the database inside the profile where declarative extension
 // rules are stored.
 extern const char kRulesStoreName[];
 
 // The URL query parameter key corresponding to multi-login user index.
 extern const char kAuthUserQueryKey[];
 
+// Mime type strings
+extern const char kMimeTypeJpeg[];
+extern const char kMimeTypePng[];
+
 // The extension id of the Web Store component application.
 extern const char kWebStoreAppId[];
 
 }  // namespace extensions
 
 namespace extension_misc {
 
 // Matches chrome.windows.WINDOW_ID_NONE.
 const int kUnknownWindowId = -1;
 
@@ skipping 28 matching lines @@
   const ui::ScaleFactor scale;
 };
 
 // The icon representations for extension actions.
 extern const IconRepresentationInfo kExtensionActionIconSizes[];
 const size_t kNumExtensionActionIconSizes = 2u;
 
 }  // namespace extension_misc
 
 #endif  // EXTENSIONS_COMMON_CONSTANTS_H_