Revert "Reland "Pass NetworkMonitorFactory through PeerConnectionFactory.""

This reverts commit 7ded73351870bfb45160fa6b9db71a94fe49397b.

Reason for revert: Found more code calling NetworkMonitorFactory::SetFactory...

Original change's description:
> Reland "Pass NetworkMonitorFactory through PeerConnectionFactory."
> 
> This is a reland of 003c9be817817ed0e3aef3f50c78ae5cb31bc0ff
> 
> Original change's description:
> > Pass NetworkMonitorFactory through PeerConnectionFactory.
> >
> > Previously the instance was set through a static method, which was
> > really only done because it was difficult to add new
> > PeerConnectionFactory construction arguments at the time.
> >
> > Now that we have PeerConnectionFactoryDependencies it's easy to clean
> > this up.
> >
> > I'm doing this because I plan to add a NetworkMonitor implementation
> > for iOS, and don't want to inherit this ugliness.
> >
> > Bug: webrtc:9883
> > Change-Id: Id94dc061ab1c7186b81af8547393a6e336ff04c2
> > Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/180241
> > Reviewed-by: Harald Alvestrand <hta@webrtc.org>
> > Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
> > Commit-Queue: Taylor <deadbeef@webrtc.org>
> > Cr-Commit-Position: refs/heads/master@{#31815}
> 
> TBR=hta@webrtc.org, sakal@webrtc.org
> 
> Bug: webrtc:9883
> Change-Id: Ibf69a22e8f94226908636c7d50ff9eda65bd4129
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/180720
> Reviewed-by: Taylor <deadbeef@webrtc.org>
> Commit-Queue: Taylor <deadbeef@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#31822}

TBR=deadbeef@webrtc.org,sakal@webrtc.org,hta@webrtc.org

Change-Id: Iae51b94072cec9abc021eed4e51d1fbeee998adc
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:9883
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/180721
Reviewed-by: Taylor <deadbeef@webrtc.org>
Commit-Queue: Taylor <deadbeef@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31823}

sdk/android/native_api/base/network_monitor.h

@@ -15,7 +15,7 @@
 
 #include <memory>
 
-#include "rtc_base/network_monitor_factory.h"
+#include "rtc_base/network_monitor.h"
 
 namespace webrtc {