Remove obsolete bug for main frame document intersection coordinates.

The main frame document intersection was previously reworked to be
in the coordinate system of the main frame.

BUG=1085175

Change-Id: I9c16b490de39f9a90a0132ba78cdf45f5c5ffca8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2476496
Commit-Queue: Justin Miron <justinmiron@google.com>
Reviewed-by: John Delaney <johnidel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817742}

chrome/browser/page_load_metrics/page_load_metrics_browsertest.cc

@@ -2767,8 +2767,6 @@ IN_PROC_BROWSER_TEST_F(PageLoadMetricsBrowserTest,
 
 // Creates a single frame within the main frame and verifies the intersection
 // with the main frame.
-// TODO(https://crbug/1085175): Main frame document intersections need to be
-// transformed into the main frame documents coordinate system.
 IN_PROC_BROWSER_TEST_F(PageLoadMetricsBrowserTest,
                        MainFrameIntersectionSingleFrame) {
   ASSERT_TRUE(embedded_test_server()->Start());