Delete js_platform_hostasserts fileset.

The hostasserts and non-hostasserts filesets do not differ significantly
and can be merged for ease of maintenance. The cost of copying extra
files is small compared to building, and we currently lack the
granularity to see meaningful savings in builds if we keep them separate.

Change-Id: If8e3dd1013f60b05dabb104c632abd7a1638fe1d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/417947
Reviewed-by: Sigmund Cherem <sigmund@google.com>
Reviewed-by: Nicholas Shahan <nshahan@google.com>

tools/bots/test_matrix.json

@@ -13,36 +13,9 @@
       "xcodebuild/ReleaseX64/dart-sdk/"
     ],
     "js_platform": [
-      ".dart_tool/package_config.json",
-      "out/ReleaseX64/dart-sdk/",
-      "out/ReleaseX64/gen/utils/ddc/",
-      "pkg/",
-      "runtime/tests/",
-      "sdk/",
-      "tests/co19/co19-analyzer.status",
-      "tests/co19/co19-co19.status",
-      "tests/co19/co19-dart2js.status",
-      "tests/co19/co19-dart2wasm.status",
-      "tests/co19/co19-dartdevc.status",
-      "tests/co19/co19-kernel.status",
-      "tests/co19/co19-runtime.status",
-      "tests/corelib/",
-      "tests/dartdevc/",
-      "tests/ffi/",
-      "tests/language/",
-      "tests/lib/",
-      "tests/web/",
-      "third_party/babel/babel.min.js",
-      "third_party/d8/",
-      "third_party/pkg/",
-      "third_party/requirejs/",
-      "tools/",
-      "xcodebuild/ReleaseARM64/dart-sdk/",
-      "xcodebuild/ReleaseARM64/gen/utils/ddc/"
-    ],
-    "js_platform_hostasserts": [
       ".dart_tool/package_config.json",
       "out/ReleaseX64/dart",
+      "out/ReleaseX64/dart-sdk/",
       "out/ReleaseX64/dart2js_platform.dill",
       "out/ReleaseX64/ddc_outline.dill",
       "out/ReleaseX64/gen/utils/ddc/",
@@ -65,7 +38,9 @@
       "third_party/d8/",
       "third_party/pkg/",
       "third_party/requirejs/",
-      "tools/"
+      "tools/",
+      "xcodebuild/ReleaseARM64/dart-sdk/",
+      "xcodebuild/ReleaseARM64/gen/utils/ddc/"
     ],
     "dart2wasm_hostasserts": [
       ".dart_tool/package_config.json",
@@ -2279,7 +2254,7 @@
             "web"
           ],
           "shards": 12,
-          "fileset": "js_platform_hostasserts"
+          "fileset": "js_platform"
         }
       ]
     },
@@ -2444,7 +2419,7 @@
             "web"
           ],
           "shards": 6,
-          "fileset": "js_platform_hostasserts"
+          "fileset": "js_platform"
         },
         {
           "name": "dart2js chrome tests",
@@ -2454,7 +2429,7 @@
             "web"
           ],
           "shards": 3,
-          "fileset": "js_platform_hostasserts"
+          "fileset": "js_platform"
         },
         {
           "name": "dart2js chrome co19 tests",
@@ -2463,7 +2438,7 @@
             "co19"
           ],
           "shards": 6,
-          "fileset": "js_platform_hostasserts"
+          "fileset": "js_platform"
         }
       ]
     },
@@ -2538,7 +2513,7 @@
             "web"
           ],
           "shards": 13,
-          "fileset": "js_platform_hostasserts"
+          "fileset": "js_platform"
         }
       ]
     },