drm: remove unused constructor of DrmDevica and GbmDevice.

ui/ozone/platform/drm/gpu/drm_device.cc

 // 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.
 
 #include "ui/ozone/platform/drm/gpu/drm_device.h"
 
 #include <fcntl.h>
 #include <sys/mman.h>
 #include <unistd.h>
 #include <xf86drm.h>
@@ skipping 250 matching lines @@
   scoped_refptr<DrmDevice::PageFlipManager> page_flip_manager_;
 
   base::MessagePumpLibevent::FileDescriptorWatcher controller_;
 
   bool paused_;
   int fd_;
 
   DISALLOW_COPY_AND_ASSIGN(IOWatcher);
 };
 
-DrmDevice::DrmDevice(const base::FilePath& device_path)
-    : device_path_(device_path),
-      file_(device_path,
-            base::File::FLAG_OPEN | base::File::FLAG_READ |
-                base::File::FLAG_WRITE),
-      page_flip_manager_(new PageFlipManager()) {
-  LOG_IF(FATAL, !file_.IsValid())
-      << "Failed to open '" << device_path_.value()
-      << "': " << base::File::ErrorToString(file_.error_details());
-}
-
 DrmDevice::DrmDevice(const base::FilePath& device_path, base::File file)
     : device_path_(device_path),
       file_(file.Pass()),
       page_flip_manager_(new PageFlipManager()) {
 }
 
 DrmDevice::~DrmDevice() {
   if (watcher_)
     watcher_->Shutdown();
 }
@@ skipping 330 matching lines @@
     b.push_back(lut[i].b);
   }
 
   DCHECK(file_.IsValid());
   TRACE_EVENT0("drm", "DrmDevice::SetGamma");
   return (drmModeCrtcSetGamma(file_.GetPlatformFile(), crtc_id, r.size(), &r[0],
                               &g[0], &b[0]) == 0);
 }
 
 }  // namespace ui