Remove MTP support on Linux.

chrome/browser/media_galleries/chromeos/mtp_device_task_helper.h

Index: chrome/browser/media_galleries/chromeos/mtp_device_task_helper.h
diff --git a/chrome/browser/media_galleries/linux/mtp_device_task_helper.h b/chrome/browser/media_galleries/chromeos/mtp_device_task_helper.h
similarity index 97%
rename from chrome/browser/media_galleries/linux/mtp_device_task_helper.h
rename to chrome/browser/media_galleries/chromeos/mtp_device_task_helper.h
index 9a55c17fff211c2df085ffce7ed32badef38cee3..f4e34ad4c07863178cd5b22ea3fa079fc9d4556a 100644
--- a/chrome/browser/media_galleries/linux/mtp_device_task_helper.h
+++ b/chrome/browser/media_galleries/chromeos/mtp_device_task_helper.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROME_BROWSER_MEDIA_GALLERIES_LINUX_MTP_DEVICE_TASK_HELPER_H_
-#define CHROME_BROWSER_MEDIA_GALLERIES_LINUX_MTP_DEVICE_TASK_HELPER_H_
+#ifndef CHROME_BROWSER_MEDIA_GALLERIES_CHROMEOS_MTP_DEVICE_TASK_HELPER_H_
+#define CHROME_BROWSER_MEDIA_GALLERIES_CHROMEOS_MTP_DEVICE_TASK_HELPER_H_
 
 #include <stddef.h>
 #include <stdint.h>
@@ -247,4 +247,4 @@ class MTPDeviceTaskHelper {
   DISALLOW_COPY_AND_ASSIGN(MTPDeviceTaskHelper);
 };
 
-#endif  // CHROME_BROWSER_MEDIA_GALLERIES_LINUX_MTP_DEVICE_TASK_HELPER_H_
+#endif  // CHROME_BROWSER_MEDIA_GALLERIES_CHROMEOS_MTP_DEVICE_TASK_HELPER_H_