Remove direct Microsoft.NETCore.Platforms dependency.

- Microsoft.NETCore.App now pulls this package in.

aspnet/Coherence-Signed#344

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

@@ -1,7 +1,6 @@
 {
   "dependencies": {
     "dotnet-test-xunit": "1.0.0-*",
-    "Microsoft.NETCore.Platforms": "1.0.1-*",
     "Microsoft.AspNetCore.Cryptography.Internal": "1.0.0-*",
     "Microsoft.AspNetCore.DataProtection.Test.Shared": {
       "type": "build",

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

@@ -1,7 +1,6 @@
 {
   "dependencies": {
     "dotnet-test-xunit": "1.0.0-*",
-    "Microsoft.NETCore.Platforms": "1.0.1-*",
     "Microsoft.AspNetCore.Cryptography.Internal": "1.0.0-*",
     "Microsoft.AspNetCore.Cryptography.KeyDerivation": "1.0.0-*",
     "Microsoft.AspNetCore.DataProtection.Test.Shared": "1.0.0-*",

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

@@ -1,7 +1,6 @@
 {
   "dependencies": {
     "dotnet-test-xunit": "1.0.0-*",
-    "Microsoft.NETCore.Platforms": "1.0.1-*",
     "Microsoft.AspNetCore.Cryptography.Internal": "1.0.0-*",
     "Microsoft.AspNetCore.DataProtection.Abstractions": "1.0.0-*",
     "Microsoft.AspNetCore.Testing": "1.0.0-*",

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

@@ -1,7 +1,6 @@
 {
   "dependencies": {
     "dotnet-test-xunit": "1.0.0-*",
-    "Microsoft.NETCore.Platforms": "1.0.1-*",
     "Microsoft.AspNetCore.DataProtection.Abstractions": "1.0.0-*",
     "Microsoft.AspNetCore.DataProtection.Extensions": "1.0.0-*",
     "Microsoft.AspNetCore.DataProtection.Test.Shared": {

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

@@ -2,7 +2,6 @@
   "dependencies": {
     "System.Runtime.InteropServices.RuntimeInformation": "4.0.0-*",
     "dotnet-test-xunit": "1.0.0-*",
-    "Microsoft.NETCore.Platforms": "1.0.1-*",
     "Microsoft.AspNetCore.DataProtection": "1.0.0-*",
     "Microsoft.AspNetCore.DataProtection.Test.Shared": {
       "type": "build",