[Remoting Client] Disable OpenGL renderer on Windows

CL 2196493002 brought ANGLE libGLESv2 dependency to the remoting unittest on
Windows. For some reason the Windows clang tester built 64-bit unittest
binary but tries to link it with a 32-bit ANGLE binary. Since the OpenGL
renderer is not used on Windows anyway, we may just disable the unit test on
Windows until we figure out what went wrong with the build setup.

BUG=642027

Review-Url: https://codereview.chromium.org/2303883004
Cr-Commit-Position: refs/heads/master@{#417440}

remoting/client/BUILD.gn

@@ -147,7 +147,6 @@ source_set("unit_tests") {
     "client_telemetry_logger_unittest.cc",
     "dual_buffer_frame_consumer_unittest.cc",
     "empty_cursor_filter_unittest.cc",
-    "gl_renderer_unittest.cc",
     "key_event_mapper_unittest.cc",
     "normalizing_input_filter_cros_unittest.cc",
     "normalizing_input_filter_mac_unittest.cc",
@@ -166,11 +165,17 @@ source_set("unit_tests") {
 
   deps = [
     ":client",
-    ":opengl_renderer",
     ":test_support",
     "//remoting/proto",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/webrtc",
   ]
+
+  if (!is_win) {
+    # Windows clang builder fails to link the test binary with ANGLE GLESv2.
+    # crbug.com/642027
+    sources += [ "gl_renderer_unittest.cc" ]
+    deps += [ ":opengl_renderer" ]
+  }
 }