Update comment terminology in c/b/c/arc/a11y/.*

Update comments to follow convetions mentioned in
https://developers.google.com/style/inclusive-documentation.

Also perform some refactoring of other comments to ensure consistency/
readability.

Bug: 842296
Test: N/A
Change-Id: I389463cc5ccd8f21983ee83383df07521c58aa07
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2265695
Commit-Queue: Sara Kato <sarakato@chromium.org>
Commit-Queue: Hiroki Sato <hirokisato@chromium.org>
Auto-Submit: Sara Kato <sarakato@chromium.org>
Reviewed-by: Hiroki Sato <hirokisato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782225}

chrome/browser/chromeos/arc/accessibility/accessibility_node_info_data_wrapper.cc

@@ -431,7 +431,7 @@ void AccessibilityNodeInfoDataWrapper::Serialize(
                                    state_description);
     } else {
       // TODO(sahok): Append strings anotated as kDescription(which is now
-      // overwritten)
+      // overwritten).
       out_data->AddStringAttribute(ax::mojom::StringAttribute::kDescription,
                                    state_description);
     }

chrome/browser/chromeos/arc/accessibility/arc_accessibility_helper_bridge.cc

@@ -547,8 +547,9 @@ void ArcAccessibilityHelperBridge::OnNotificationSurfaceAdded(
   // notification updated. As order of OnNotificationSurfaceAdded call is not
   // guaranteed, we are dispatching the event in both
   // ArcAccessibilityHelperBridge and ArcNotificationContentView. The event
-  // needs to be dispatched after 1. ax tree id is set to the surface, 2 the
-  // surface is attached to the content view.
+  // needs to be dispatched after:
+  // 1. ax_tree_id is set to the surface
+  // 2. the surface is attached to the content view
   if (surface->IsAttached()) {
     surface->GetAttachedHost()->NotifyAccessibilityEvent(
         ax::mojom::Event::kChildrenChanged, false);

chrome/browser/chromeos/arc/accessibility/arc_accessibility_helper_bridge.h

@@ -42,8 +42,8 @@ class ArcBridgeService;
 arc::mojom::CaptionStylePtr GetCaptionStyleFromPrefs(PrefService* prefs);
 
 // ArcAccessibilityHelperBridge is an instance to receive converted Android
-// accessibility events and info via mojo interface and dispatch them to chrome
-// os components.
+// accessibility events and info via mojo interface and dispatch them to Chrome
+// OS components.
 class ArcAccessibilityHelperBridge
     : public KeyedService,
       public mojom::AccessibilityHelperHost,

chrome/browser/chromeos/arc/accessibility/arc_accessibility_util.cc

@@ -172,7 +172,7 @@ std::string ToLiveStatusString(mojom::AccessibilityLiveRegionType type) {
     default:
       NOTREACHED();
   }
-  return std::string();  // Dummy.
+  return std::string();  // Placeholder.
 }
 
 }  // namespace arc

chrome/browser/chromeos/arc/accessibility/ax_tree_source_arc_unittest.cc

@@ -349,7 +349,7 @@ TEST_F(AXTreeSourceArcTest, ReorderChildrenByLayout) {
 
   EXPECT_EQ(10, GetDispatchedEventCount(ax::mojom::Event::kFocus));
 
-  // Sanity check tree output.
+  // Check completeness of tree output.
   ExpectTree(
       "id=100 window FOCUSABLE (0, 0)-(0, 0) modal=true child_ids=10\n"
       "  id=10 genericContainer INVISIBLE (0, 0)-(0, 0) restriction=disabled "