Version 2.18.0-28.0.dev

Merge commit '5d57025835a54ac48ebf1b9e3afe6c2063ee6c15' into 'dev'
diff --git a/DEPS b/DEPS
index 2061c1c..f6dfe398 100644
--- a/DEPS
+++ b/DEPS
@@ -92,7 +92,7 @@
   "clock_rev" : "5631a0612f4ac7e1b32f7c9a00fc7c00a41615e1",
   "collection_rev": "e1407da23b9f17400b3a905aafe2b8fa10db3d86",
   "convert_rev": "e063fdca4bebffecbb5e6aa5525995120982d9ce",
-  "crypto_rev": "b5024e4de2b1c474dd558bef593ddbf0bfade152",
+  "crypto_rev": "3bae7168183264bb47e7ef576d3881a2f572f89c",
   "csslib_rev": "518761b166974537f334dbf264e7f56cb157a96a",
 
   # Note: Updates to dart_style have to be coordinated with the infrastructure
@@ -151,7 +151,6 @@
   "shelf_rev": "78ac724a7944700340a3cef28c84bccbe62e9367",
   "shelf_web_socket_rev": "24fb8a04befa75a94ac63a27047b231d1a22aab4",
   "source_map_stack_trace_rev": "8eabd96b1811e30a11d3c54c9b4afae4fb72e98f",
-  "source_maps-0.9.4_rev": "38524",
   "source_maps_rev": "c07a01b8d5547ce3a47ee7a7a2b938a2bc09afe3",
   "source_span_rev": "8ae724c3e67f5afaacead44e93ff145bfb8775c7",
   "sse_rev": "9084339389eb441d0c0518cddac211a097e78657",
diff --git a/tools/VERSION b/tools/VERSION
index 2ca8e5a..bdada8d 100644
--- a/tools/VERSION
+++ b/tools/VERSION
@@ -27,5 +27,5 @@
 MAJOR 2
 MINOR 18
 PATCH 0
-PRERELEASE 27
+PRERELEASE 28
 PRERELEASE_PATCH 0
\ No newline at end of file