Windows: cefclient: Create a new D3D11 device for each browser (issue #2538)

This fixes a texture resizing issue when creating multiple windows with OSR
and shared textures enabled.

tests/cefclient/browser/main_context_impl_win.cc

@@ -7,8 +7,6 @@
 #include <direct.h>
 #include <shlobj.h>
 
-#include "tests/cefclient/browser/osr_d3d11_win.h"
-
 namespace client {
 
 std::string MainContextImpl::GetDownloadPath(const std::string& file_name) {
@@ -38,11 +36,4 @@ std::string MainContextImpl::GetAppWorkingDirectory() {
   return szWorkingDir;
 }
 
-std::shared_ptr<d3d11::Device> MainContextImpl::GetD3D11Device() {
-  CEF_REQUIRE_UI_THREAD();
-  if (!d3d11_device_)
-    d3d11_device_ = d3d11::Device::create();
-  return d3d11_device_;
-}
-
 }  // namespace client