Add a mimeHandler extension API.

chrome/common/extensions/extension_constants.h

Index: chrome/common/extensions/extension_constants.h
diff --git a/chrome/common/extensions/extension_constants.h b/chrome/common/extensions/extension_constants.h
index cc3dbf7eaf49fc97b3334f8a201bb7dcf68ebe74..699ce8df2460550182ffdea7fdaf0afc62d8ee9c 100644
--- a/chrome/common/extensions/extension_constants.h
+++ b/chrome/common/extensions/extension_constants.h
@@ -85,24 +85,9 @@ extern const char kHotwordNewExtensionId[];
 // The extension id of the hotword shared module.
 extern const char kHotwordSharedModuleId[];
 
-// The extension id of the PDF extension.
-extern const char kPdfExtensionId[];
-
-// The extension id of the Office Viewer component extension.
-extern const char kQuickOfficeComponentExtensionId[];
-
-// The extension id of the Office Viewer extension on the internal webstore.
-extern const char kQuickOfficeInternalExtensionId[];
-
-// The extension id of the Office Viewer extension.
-extern const char kQuickOfficeExtensionId[];
-
 // The extension id of the settings application.
 extern const char kSettingsAppId[];
 
-// The extension id used for testing streamsPrivate
-extern const char kStreamsPrivateTestExtensionId[];
-
 // The extension id of the Youtube application.
 extern const char kYoutubeAppId[];