[benchmarking] Remove redundant "tests/benchmarks" package

Remove the redundant "topaz/packages/tests/benchmarks" package, in order
to be more consistent with the benchmarks package structure in garnet
and peridot (i.e., only have a "packages/benchmarks/*").

Test: CQ
Change-Id: I3a34926115048d645e541ef28fd190f002685128
diff --git a/packages/tests/all b/packages/tests/all
index af0961d..9b330a2 100644
--- a/packages/tests/all
+++ b/packages/tests/all
@@ -2,7 +2,6 @@
     "imports": [
         "garnet/packages/tests/run_test_component",
         "topaz/packages/tests/auth_provider_unittests",
-        "topaz/packages/tests/benchmarks",
         "topaz/packages/tests/bindings_tests",
         "topaz/packages/tests/crasher_dart",
         "topaz/packages/tests/dart",
diff --git a/packages/tests/benchmarks b/packages/tests/benchmarks
deleted file mode 100644
index 492a8ac..0000000
--- a/packages/tests/benchmarks
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-    "packages": [
-        "//topaz/tests/benchmarks:topaz_benchmarks",
-        "//topaz/tests/benchmarks/story_startup:startup_benchmarks"
-    ]
-}