Remove a few meaningless TODOs

R=asapersson@webrtc.org

Review URL: https://codereview.webrtc.org/2203363002 .

Cr-Commit-Position: refs/heads/master@{#13624}

webrtc/modules/video_capture/mac/qtkit/video_capture_qtkit_objc.mm

@@ -220,7 +220,6 @@ using namespace videocapturemodule;
 - (void)captureOutput:(QTCaptureOutput *)captureOutput
     didDropVideoFrameWithSampleBuffer:(QTSampleBuffer *)sampleBuffer
                        fromConnection:(QTCaptureConnection *)connection {
-  // TODO(mflodman) Experiment more when this happens.
 }
 
 - (void)captureOutput:(QTCaptureOutput *)captureOutput

webrtc/test/fake_network_pipe.h

@@ -63,7 +63,6 @@ class NetworkPacket {
 // capacity and adding an extra transport delay in addition to the capacity
 // introduced delay.
 
-// TODO(mflodman) Add random and bursty packet loss.
 class FakeNetworkPipe {
  public:
   struct Config {

webrtc/test/video_renderer.cc

@@ -24,10 +24,8 @@ VideoRenderer* VideoRenderer::Create(const char* window_title,
                                      size_t width,
                                      size_t height) {
   VideoRenderer* renderer = CreatePlatformRenderer(window_title, width, height);
-  if (renderer != NULL) {
-    // TODO(mflodman) Add a warning log.
+  if (renderer != nullptr)
     return renderer;
-  }
 
   return new NullRenderer();
 }