roll ndk with string inline tweaks
diff --git a/DEPS b/DEPS
index ccc9c2e..a4cdac9 100644
--- a/DEPS
+++ b/DEPS
@@ -1,7 +1,7 @@
 use_relative_paths = True
 
 vars = {
-  'ndk_revision': 'eecd8c2d681b019efca486f92fdda9a93f52328f',
+  'ndk_revision': '6c4a8d15acb35c56b7dd5d188017cbd8e34aa746',
 }
 deps = {
   'ndk': 'https://chromium.googlesource.com/android_ndk.git' + '@' + Var('ndk_revision'),