Fixing WebRTC after moving from src/webrtc to src/

In https://webrtc-review.googlesource.com/c/src/+/1560 we moved WebRTC
from src/webrtc to src/ (in order to preserve an healthy git history).
This CL takes care of fixing header guards, #include paths, etc...

NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
TBR=tommi@webrtc.org


Bug: chromium:611808
Change-Id: Iea91618212bee0af16aa3f05071eab8f93706578
Reviewed-on: https://webrtc-review.googlesource.com/1561
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Henrik Kjellander <kjellander@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#19846}
diff --git a/rtc_tools/video_analysis.py b/rtc_tools/video_analysis.py
index 1a7bb48..a5d267b 100755
--- a/rtc_tools/video_analysis.py
+++ b/rtc_tools/video_analysis.py
@@ -408,7 +408,7 @@
 
 
 def CompareVideos(options, cropped_ref_file, cropped_test_file):
-  """Runs the compare_video.py script from src/webrtc/rtc_tools using path.
+  """Runs the compare_video.py script from src/rtc_tools using path.
 
   Uses the path from recording_result and writes the output to a file named
   <options.app_name + '_' + CURRENT_TIME + '_result.txt> in the reference video