Respect the clipboardRead and clipboardWrite permissions in content scripts.

chrome/common/extensions/chrome_extension_messages.h

 // 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.
 
 // Chrome-specific IPC messages for extensions.
 // Extension-related messages that aren't specific to Chrome live in
 // extensions/common/extension_messages.h.
 //
 // Multiply-included message file, hence no include guard.
 
@@ skipping 53 matching lines @@
 // Send to renderer once the installation mentioned on
 // ExtensionHostMsg_InlineWebstoreInstall is complete.
 IPC_MESSAGE_ROUTED4(ExtensionMsg_InlineWebstoreInstallResponse,
                     int32 /* install id */,
                     bool /* whether the install was successful */,
                     std::string /* error */,
                     extensions::webstore_install::Result /* result */)
 
 // Messages sent from the renderer to the browser.
 
-// Sent by the renderer to check if a URL has permission to trigger a clipboard
-// read/write operation from the DOM.
-IPC_SYNC_MESSAGE_CONTROL1_1(ChromeViewHostMsg_CanTriggerClipboardRead,
-                            GURL /* origin */,
-                            bool /* allowed */)
-IPC_SYNC_MESSAGE_CONTROL1_1(ChromeViewHostMsg_CanTriggerClipboardWrite,
-                            GURL /* origin */,
-                            bool /* allowed */)
 
 // Sent by the renderer to implement chrome.webstore.install().
 IPC_MESSAGE_ROUTED5(ExtensionHostMsg_InlineWebstoreInstall,
                     int32 /* install id */,
                     int32 /* return route id */,
                     std::string /* Web Store item ID */,
                     GURL /* requestor URL */,
                     int /* listeners_mask */)
 
 IPC_MESSAGE_ROUTED1(ChromeExtensionHostMsg_DidGetApplicationInfo,
                     WebApplicationInfo)