Add an accessibility audit test for WebUI pages

.gitmodules

Index: .gitmodules
diff --git a/.gitmodules b/.gitmodules
index f0b44be9c011dca3e7d2d8757fcf03d385a2b732..85c287616a4ef443f883a948801792798da80ae7 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -186,6 +186,10 @@
 	path = third_party/ffmpeg
 	url = https://chromium.googlesource.com/chromium/third_party/ffmpeg.git
 	os = all
+[submodule "third_party/findbugs"]
+	path = third_party/findbugs
+	url = https://chromium.googlesource.com/chromium/deps/findbugs.git
+	os = android
 [submodule "third_party/flac"]
 	path = third_party/flac
 	url = https://chromium.googlesource.com/chromium/deps/flac.git
@@ -282,14 +286,6 @@
 	path = third_party/mingw-w64/mingw/bin
 	url = https://chromium.googlesource.com/native_client/deps/third_party/mingw-w64/mingw/bin.git
 	os = win
-[submodule "third_party/mozc/chrome/chromeos/renderer"]
-	path = third_party/mozc/chrome/chromeos/renderer
-	url = https://chromium.googlesource.com/external/mozc/src/chrome/chromeos/renderer.git
-	os = all
-[submodule "third_party/mozc/session"]
-	path = third_party/mozc/session
-	url = https://chromium.googlesource.com/external/mozc/src/session.git
-	os = all
 [submodule "third_party/mtpd/source"]
 	path = third_party/mtpd/source
 	url = https://chromium.googlesource.com/chromiumos/platform/mtpd.git
@@ -432,7 +428,7 @@
 	os = all
 [submodule "third_party/webrtc"]
 	path = third_party/webrtc
-	url = https://chromium.googlesource.com/external/webrtc/stable/src.git
+	url = https://chromium.googlesource.com/external/webrtc/stable/webrtc.git
 	os = all
 [submodule "third_party/xdg-utils"]
 	path = third_party/xdg-utils