Prepare for -Wall for third-party code, -Wextra for chromium_code

media/capture/video/linux/v4l2_capture_delegate.h

 // Copyright 2015 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 MEDIA_VIDEO_CAPTURE_LINUX_V4L2_VIDEO_CAPTURE_DELEGATE_H_
 #define MEDIA_VIDEO_CAPTURE_LINUX_V4L2_VIDEO_CAPTURE_DELEGATE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 52 matching lines @@
   // S/MPLANE but not construction, so this is implemented in derived classes.
   // Internally it has a vector of planes, which for SPLANE will contain only
   // one element.
   class BufferTracker : public base::RefCounted<BufferTracker> {
    public:
     BufferTracker();
     // Abstract method to mmap() given |fd| according to |buffer|, planarity
     // specific.
     virtual bool Init(int fd, const v4l2_buffer& buffer) = 0;
 
-    uint8_t* const GetPlaneStart(size_t plane) const {
+    const uint8_t* GetPlaneStart(size_t plane) const {
       DCHECK_LT(plane, planes_.size());
       return planes_[plane].start;
     }
 
     size_t GetPlanePayloadSize(size_t plane) const {
       DCHECK_LT(plane, planes_.size());
       return planes_[plane].payload_size;
     }
 
     void SetPlanePayloadSize(size_t plane, size_t payload_size) {
@@ skipping 84 matching lines @@
 
   // Clockwise rotation in degrees. This value should be 0, 90, 180, or 270.
   int rotation_;
 
   DISALLOW_COPY_AND_ASSIGN(V4L2CaptureDelegate);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_VIDEO_CAPTURE_LINUX_V4L2_VIDEO_CAPTURE_DELEGATE_H_