[master] Update dependencies from dotnet/winforms (#1582)

* Update dependencies from https://github.com/dotnet/winforms build 20190809.1

- Microsoft.Private.Winforms - 4.8.0-preview9.19409.1

* Update dependencies from https://github.com/dotnet/winforms build 20190809.2

- Microsoft.Private.Winforms - 4.8.0-preview9.19409.2

eng/Version.Details.xml

 <?xml version="1.0" encoding="utf-8"?>
 <Dependencies>
   <ProductDependencies>
-    <Dependency Name="Microsoft.Private.Winforms" Version="4.8.0-preview9.19408.6">
+    <Dependency Name="Microsoft.Private.Winforms" Version="4.8.0-preview9.19409.2">
       <Uri>https://github.com/dotnet/winforms</Uri>
-      <Sha>0c6d3c1d93d5def0392bc165f5b422a586e6bfcd</Sha>
+      <Sha>e567af795da9727f34a177c7a7ad8492e2fd1451</Sha>
     </Dependency>
   </ProductDependencies>
   <ToolsetDependencies>

eng/Versions.props

@@ -8,7 +8,7 @@
   </PropertyGroup>
   <!-- NuGet Package Versions -->
   <PropertyGroup>
-    <MicrosoftPrivateWinformsVersion>4.8.0-preview9.19408.6</MicrosoftPrivateWinformsVersion>
+    <MicrosoftPrivateWinformsVersion>4.8.0-preview9.19409.2</MicrosoftPrivateWinformsVersion>
   </PropertyGroup>
   <!-- Packages that come from https://github.com/dotnet/coreclr -->
   <PropertyGroup>