Include webrtc/base/json.h rather than from jsoncpp directly.

This makes us use the clever code that adapts the path depending on where we build, so it works in google3 too.

BUG=None

Review URL: https://codereview.webrtc.org/1291283003

Cr-Commit-Position: refs/heads/master@{#9752}
diff --git a/webrtc/modules/video_capture/android/device_info_android.cc b/webrtc/modules/video_capture/android/device_info_android.cc
index 02075d5..974717c 100644
--- a/webrtc/modules/video_capture/android/device_info_android.cc
+++ b/webrtc/modules/video_capture/android/device_info_android.cc
@@ -14,8 +14,8 @@
 #include <sstream>
 #include <vector>
 
-#include "json/json.h"
 #include "unicode/unistr.h"
+#include "webrtc/base/json.h"
 #include "webrtc/modules/video_capture/android/video_capture_android.h"
 #include "webrtc/system_wrappers/interface/logging.h"
 #include "webrtc/system_wrappers/interface/ref_count.h"