Bring in the latest pub

Bug: 32593
Change-Id: I4a8ce82591249968cfb00e9c57ddf75afb760d14
Reviewed-on: https://dart-review.googlesource.com/52700
Commit-Queue: Nate Bosch <nbosch@google.com>
Reviewed-by: Kevin Moore <kevmoo@google.com>

CHANGELOG.md

@@ -14,6 +14,9 @@
 
 #### Pub
 
+* The `build` and `serve` commands will now fail and point users to
+  https://webdev.dartlang.org/dart-2
+
 #### Other Tools
 
 ## 2.0.0-dev.49.0

DEPS

@@ -114,7 +114,7 @@ vars = {
   "ply_rev": "@604b32590ffad5cbb82e4afef1d305512d06ae93",
   "pool_tag": "@1.3.4",
   "protobuf_tag": "@0.7.1",
-  "pub_rev": "@4947e0b3cb3ec77e4e8fe0d3141ce4dc60f43256",
+  "pub_rev": "@2e821bff00c00889afe5200e3a33f280ce942336",
   "pub_semver_tag": "@1.3.7",
   "quiver_tag": "@5aaa3f58c48608af5b027444d561270b53f15dbf",
   "resource_rev":"@af5a5bf65511943398146cf146e466e5f0b95cb9",

sdk/BUILD.gn

@@ -270,21 +270,6 @@ copy_tree_specs += [ {
       ignore_patterns = "{}"
     } ]
 
-# This rule copies pub assets to lib/_internal/pub/asset
-copy_tree_specs += [ {
-      target = "copy_pub_assets"
-      visibility = [
-        ":create_common_sdk",
-        ":copy_7zip",
-      ]
-      deps = [
-        ":copy_libraries",
-      ]
-      source = "../third_party/pkg/pub/lib/src/asset"
-      dest = "$root_out_dir/dart-sdk/lib/_internal/pub/asset"
-      ignore_patterns = "{}"
-    } ]
-
 # This loop generates rules to copy libraries to lib/
 foreach(library, _full_sdk_libraries) {
   copy_tree_specs += [ {
@@ -305,7 +290,6 @@ if (is_win) {
         visibility = [ ":create_common_sdk" ]
         deps = [
           ":copy_libraries",
-          ":copy_pub_assets",
         ]
         source = "../third_party/7zip"
         dest = "$root_out_dir/dart-sdk/lib/_internal/pub/asset/7zip"
@@ -959,7 +943,6 @@ group("create_common_sdk") {
     ":copy_license",
     ":copy_libraries_specification",
     ":copy_platform_files",
-    ":copy_pub_assets",
     ":copy_readme",
     ":copy_vm_dill_files",
     ":write_revision_file",