[VizHitTesting] Re-enable SitePerProcessHitTestBrowserTest.CreateContextMenuTest on Win

Tested locally and didn't see the crash mentioned in crbug.com/545547.

Bug: 545547
Change-Id: I597c4ae170b3d5297a18472d3e4f1b7923856057
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1897244Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Commit-Queue: Yi Gu <yigu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713860}

content/browser/site_per_process_hit_test_browsertest.cc

@@ -5598,9 +5598,8 @@ void CreateContextMenuTestHelper(
   EXPECT_NEAR(point.y(), params.y, kHitTestTolerance);
 }
 
-#if defined(OS_ANDROID) || defined(OS_WIN)
+#if defined(OS_ANDROID)
 // High DPI tests don't work properly on Android, which has fixed scale factor.
-// Windows is disabled because of https://crbug.com/545547.
 #define MAYBE_CreateContextMenuTest DISABLED_CreateContextMenuTest
 #else
 #define MAYBE_CreateContextMenuTest CreateContextMenuTest