Remove System.Runtime dependency.

- This dependency is now pulled in transitively.
- It was temporarily re-added due to a DNX bug.

test/Microsoft.AspNetCore.Cryptography.Internal.Test/project.json

@@ -12,8 +12,7 @@
   "frameworks": {
     "dnxcore50": {
       "dependencies": {
-        "dotnet-test-xunit": "1.0.0-dev-*",
-        "System.Runtime": "4.0.21-*"
+        "dotnet-test-xunit": "1.0.0-dev-*"
       },
       "imports": "portable-net451+win8"
     },

test/Microsoft.AspNetCore.Cryptography.KeyDerivation.Test/project.json

@@ -10,8 +10,7 @@
   "frameworks": {
     "dnxcore50": {
       "dependencies": {
-        "dotnet-test-xunit": "1.0.0-dev-*",
-        "System.Runtime": "4.0.21-*"
+        "dotnet-test-xunit": "1.0.0-dev-*"
       },
       "imports": "portable-net451+win8"
     },

test/Microsoft.AspNetCore.DataProtection.Abstractions.Test/project.json

@@ -10,8 +10,7 @@
     "dnxcore50": {
       "dependencies": {
         "moq.netcore": "4.4.0-beta8",
-        "dotnet-test-xunit": "1.0.0-dev-*",
-        "System.Runtime": "4.0.21-*"
+        "dotnet-test-xunit": "1.0.0-dev-*"
       },
       "imports": "portable-net451+win8"
     },

test/Microsoft.AspNetCore.DataProtection.Extensions.Test/project.json

@@ -14,8 +14,7 @@
     "dnxcore50": {
       "dependencies": {
         "moq.netcore": "4.4.0-beta8",
-        "dotnet-test-xunit": "1.0.0-dev-*",
-        "System.Runtime": "4.0.21-*"
+        "dotnet-test-xunit": "1.0.0-dev-*"
       },
       "imports": "portable-net451+win8"
     },

test/Microsoft.AspNetCore.DataProtection.Test.Shared/project.json

@@ -2,7 +2,6 @@
   "frameworks": {
     "dnxcore50": {
       "dependencies": {
-        "System.Runtime": "4.0.21-*",
         "dotnet-test-xunit": "1.0.0-dev-*",
         "Microsoft.NETCore.Platforms": "1.0.1-*"
       },

test/Microsoft.AspNetCore.DataProtection.Test/project.json

@@ -14,8 +14,7 @@
     "dnxcore50": {
       "dependencies": {
         "moq.netcore": "4.4.0-beta8",
-        "dotnet-test-xunit": "1.0.0-dev-*",
-        "System.Runtime": "4.0.21-*"
+        "dotnet-test-xunit": "1.0.0-dev-*"
       },
       "imports": "portable-net451+win8"
     },