Issue 945938: Build fails with clang/llvm-8
https://bugs.chromium.org/p/chromium/issues/detail?id=945938&q=TabStripModelChange&colspec=ID%20Pri%20M%20Stars%20ReleaseBlock%20Component%20Status%20Owner%20Summary%20OS%20Modified

diff --git a/chrome/browser/ui/tabs/tab_strip_model_observer.h b/chrome/browser/ui/tabs/tab_strip_model_observer.h
index 6c8bce5..7f67b7d 100644
--- a/chrome/browser/ui/tabs/tab_strip_model_observer.h
+++ b/chrome/browser/ui/tabs/tab_strip_model_observer.h
@@ -135,7 +135,7 @@ class TabStripModelChange {
 
  private:
   const Type type_ = kSelectionOnly;
-  const std::vector<Delta> deltas_;
+  std::vector<Delta> deltas_;
 
   DISALLOW_COPY_AND_ASSIGN(TabStripModelChange);
 };