Mac Video Capture: Change an ErrorMessage to LogMessage

media/video/capture/mac/video_capture_device_qtkit_mac.mm

Index: media/video/capture/mac/video_capture_device_qtkit_mac.mm
diff --git a/media/video/capture/mac/video_capture_device_qtkit_mac.mm b/media/video/capture/mac/video_capture_device_qtkit_mac.mm
index 7f4a853c63a9bde6d9b260a720a947d143f68cbc..86d4e82d71ac2933e44a0954db702558e663120f 100644
--- a/media/video/capture/mac/video_capture_device_qtkit_mac.mm
+++ b/media/video/capture/mac/video_capture_device_qtkit_mac.mm
@@ -140,7 +140,9 @@
   } else {
     // Remove the previously set capture device.
     if (!captureDeviceInput_) {
-      [self sendErrorString:[NSString
+      // Being here means stopping a device that never started OK in the first
+      // place, log it.
+      [self sendLogString:[NSString
           stringWithUTF8String:"No video capture device set, on removal."]];
       return YES;
     }
@@ -345,4 +347,12 @@
   [lock_ unlock];
 }
 
+- (void)sendLogString:(NSString*)message {
+  DVLOG(1) << [message UTF8String];
+  [lock_ lock];
+  if (frameReceiver_)
+    frameReceiver_->LogMessage([message UTF8String]);
+  [lock_ unlock];
+}
+
 @end