cc: removes outdated comment

ChromeOS does url bar animations using this code as well.

BUG=none
TEST=none

Change-Id: I5273cbd9205ff61ffa15c7bd8bcd63037840eb3f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1789986
Commit-Queue: Scott Violet <sky@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Auto-Submit: Scott Violet <sky@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694348}

cc/trees/layer_tree_host.h

@@ -280,8 +280,7 @@ class CC_EXPORT LayerTreeHost : public MutatorHostClient {
 
   // Input Handling ---------------------------------------------
 
-  // Sets the state of the browser controls. (Used for URL bar animations on
-  // android).
+  // Sets the state of the browser controls. (Used for URL bar animations).
   void UpdateBrowserControlsState(BrowserControlsState constraints,
                                   BrowserControlsState current,
                                   bool animate);