[Video Capture, Linux] Change log level from ERROR to INFO

Change log level for logs that appear to be normal/expected behavior for
certain webcams in order to reduce log spam.

Bug: 743093
Change-Id: I4c0b4c05a84a9d17a9777b1310a1a741f729daf4
Reviewed-on: https://chromium-review.googlesource.com/1188435Reviewed-by: Emircan Uysaler <emircan@chromium.org>
Commit-Queue: Christian Fremerey <chfremer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585898}

media/capture/video/linux/v4l2_capture_delegate.cc

@@ -718,7 +718,7 @@ void V4L2CaptureDelegate::ResetUserAndCameraControlsToDefault(int device_fd) {
   ext_controls.controls = special_camera_controls.data();
   if (HANDLE_EINTR(v4l2_->ioctl(device_fd, VIDIOC_S_EXT_CTRLS, &ext_controls)) <
       0)
-    DPLOG(ERROR) << "VIDIOC_S_EXT_CTRLS";
+    DPLOG(INFO) << "VIDIOC_S_EXT_CTRLS";
 
   std::vector<struct v4l2_ext_control> camera_controls;
   for (const auto& control : kControls) {
@@ -750,7 +750,7 @@ void V4L2CaptureDelegate::ResetUserAndCameraControlsToDefault(int device_fd) {
       ext_controls.controls = camera_controls.data();
       if (HANDLE_EINTR(
               v4l2_->ioctl(device_fd, VIDIOC_S_EXT_CTRLS, &ext_controls)) < 0)
-        DPLOG(ERROR) << "VIDIOC_S_EXT_CTRLS";
+        DPLOG(INFO) << "VIDIOC_S_EXT_CTRLS";
     }
   }
 
@@ -786,7 +786,7 @@ void V4L2CaptureDelegate::ResetUserAndCameraControlsToDefault(int device_fd) {
   ext_controls.controls = special_camera_controls.data();
   if (HANDLE_EINTR(v4l2_->ioctl(device_fd, VIDIOC_S_EXT_CTRLS, &ext_controls)) <
       0)
-    DPLOG(ERROR) << "VIDIOC_S_EXT_CTRLS";
+    DPLOG(INFO) << "VIDIOC_S_EXT_CTRLS";
 }
 
 bool V4L2CaptureDelegate::MapAndQueueBuffer(int index) {

media/capture/video/linux/video_capture_device_factory_linux.cc

@@ -267,7 +267,7 @@ bool VideoCaptureDeviceFactoryLinux::HasUsableFormats(int fd,
     }
   }
 
-  DLOG(ERROR) << "No usable formats found";
+  DVLOG(1) << "No usable formats found";
   return false;
 }