Roll Chromium 238260 -> 243863

R=andrew@webrtc.org, henrike@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/6939004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5385 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/.gitignore b/.gitignore
index 3ceaf9c..aab8f75 100644
--- a/.gitignore
+++ b/.gitignore
@@ -29,6 +29,7 @@
 .cproject
 .gdb_history
 .gdbinit
+.gn
 .metadata
 .project
 .pydevproject
@@ -36,6 +37,7 @@
 /Makefile
 /build
 /chromium_deps
+/chromium_gn
 /google_apis/build
 /gyp-mac-tool
 /net/third_party/nss/