Exclude memory_test compilation on Windows

The memory_test target fails to build on Windows due to a variety of
errors related to MOCK_METHOD(). For example:

    memory_test.cc(542,3): error: static_assert failed "(size_t) should
    be enclosed in parentheses."

This is generated by the line:
    MOCK_METHOD(value_type*, allocate, (size_t));

"(size_t)" is clearly enclosed by parentheses (the error message even
indicates this), but both clang and MSVC fail to compile correctly on
Windows due to these errors.

Bug: angleproject:4873
Bug: 1116473
Test: Build on Windows and Linux
Change-Id: Ie83e7f2ebcdbd641b9e87ac7de7ef28f19b0bbac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2353403Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Mirko Bonadei <mbonadei@chromium.org>
Commit-Queue: Tim Van Patten <timvp@google.com>
Cr-Commit-Position: refs/heads/master@{#798249}

third_party/abseil-cpp/absl/memory/BUILD.gn

@@ -14,11 +14,16 @@ absl_source_set("memory") {
 
 absl_source_set("memory_test") {
   testonly = true
-  sources = [ "memory_test.cc" ]
-  deps = [
-    ":memory",
-    "//third_party/abseil-cpp/absl/base:core_headers",
-    "//third_party/googletest:gtest",
-    "//third_party/googletest:gmock",
-  ]
+
+  # TODO(https://crbug.com/1116473): memory_test.cc fails to build in
+  # standalone ANGLE on Windows
+  if (!build_with_chromium && !is_win) {
+    sources = [ "memory_test.cc" ]
+    deps = [
+      ":memory",
+      "//third_party/abseil-cpp/absl/base:core_headers",
+      "//third_party/googletest:gmock",
+      "//third_party/googletest:gtest",
+    ]
+  }
 }