Minor comment cleanups for IdlenessDetector and FirstMeaningfulPaintDetector.

Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I3da9b8dab7ecaf9ef4552a43160b029f5147774e
Reviewed-on: https://chromium-review.googlesource.com/1143048Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576410}

third_party/blink/renderer/core/loader/idleness_detector.h

@@ -16,11 +16,11 @@ namespace blink {
 class LocalFrame;
 class ResourceFetcher;
 
-// IdlenessDetector observes network request count everytime a load is
-// finshed after DOMContentLoadedEventEnd is fired, and emit network almost idle
-// signal when there are no more than 2 network connection active in 0.5 second,
-// and emit network idle signal when there is 0 network connection active in 0.5
-// second.
+// IdlenessDetector observes the resource request count every time a load is
+// finshed after DOMContentLoadedEventEnd is fired. It emits a network almost
+// idle signal when there are no more than 2 network connections active in 0.5
+// seconds, and a network idle signal when there are 0 network connections
+// active in 0.5 seconds.
 class CORE_EXPORT IdlenessDetector
     : public GarbageCollectedFinalized<IdlenessDetector>,
       public base::sequence_manager::TaskTimeObserver {

third_party/blink/renderer/core/paint/first_meaningful_paint_detector.h

@@ -20,7 +20,7 @@ class LayoutObjectCounter;
 class PaintTiming;
 
 // FirstMeaningfulPaintDetector observes layout operations during page load
-// until network stable (2 seconds of no network activity), and computes the
+// until network stable (0.5 seconds of no network activity), and computes the
 // layout-based First Meaningful Paint.
 // See https://goo.gl/vpaxv6 and http://goo.gl/TEiMi4 for more details.
 class CORE_EXPORT FirstMeaningfulPaintDetector