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/BUILD.gn b/rtc_tools/BUILD.gn
index 2166978..5dca268 100644
--- a/rtc_tools/BUILD.gn
+++ b/rtc_tools/BUILD.gn
@@ -190,7 +190,7 @@
       sources = [
         "event_log_visualizer/chart.proto",
       ]
-      proto_out_dir = "webrtc/rtc_tools/event_log_visualizer"
+      proto_out_dir = "rtc_tools/event_log_visualizer"
     }
 
     rtc_static_library("event_log_visualizer_utils") {
@@ -281,9 +281,9 @@
   }
 
   tools_unittests_resources = [
-    "../../resources/foreman_cif.yuv",
-    "../../resources/reference_less_video_test_file.y4m",
-    "../../resources/video_quality_analysis_frame.txt",
+    "../resources/foreman_cif.yuv",
+    "../resources/reference_less_video_test_file.y4m",
+    "../resources/video_quality_analysis_frame.txt",
   ]
 
   if (is_ios) {