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/BUILD.gn b/BUILD.gn
index 6641e2f..ed80cbe 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -431,8 +431,8 @@
 
   # TODO(pbos): Rename test suite, this is no longer "just" for video targets.
   video_engine_tests_resources = [
-    "../resources/foreman_cif_short.yuv",
-    "../resources/voice_engine/audio_long16.pcm",
+    "resources/foreman_cif_short.yuv",
+    "resources/voice_engine/audio_long16.pcm",
   ]
 
   if (is_ios) {
@@ -475,19 +475,19 @@
   }
 
   webrtc_perf_tests_resources = [
-    "../resources/audio_coding/speech_mono_16kHz.pcm",
-    "../resources/audio_coding/speech_mono_32_48kHz.pcm",
-    "../resources/audio_coding/testfile32kHz.pcm",
-    "../resources/ConferenceMotion_1280_720_50.yuv",
-    "../resources/difficult_photo_1850_1110.yuv",
-    "../resources/foreman_cif.yuv",
-    "../resources/google-wifi-3mbps.rx",
-    "../resources/paris_qcif.yuv",
-    "../resources/photo_1850_1110.yuv",
-    "../resources/presentation_1850_1110.yuv",
-    "../resources/verizon4g-downlink.rx",
-    "../resources/voice_engine/audio_long16.pcm",
-    "../resources/web_screenshot_1850_1110.yuv",
+    "resources/audio_coding/speech_mono_16kHz.pcm",
+    "resources/audio_coding/speech_mono_32_48kHz.pcm",
+    "resources/audio_coding/testfile32kHz.pcm",
+    "resources/ConferenceMotion_1280_720_50.yuv",
+    "resources/difficult_photo_1850_1110.yuv",
+    "resources/foreman_cif.yuv",
+    "resources/google-wifi-3mbps.rx",
+    "resources/paris_qcif.yuv",
+    "resources/photo_1850_1110.yuv",
+    "resources/presentation_1850_1110.yuv",
+    "resources/verizon4g-downlink.rx",
+    "resources/voice_engine/audio_long16.pcm",
+    "resources/web_screenshot_1850_1110.yuv",
   ]
 
   if (is_ios) {