Fix a snackbar crash about leaking window

chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
index ce877967bf0d38eeed2e874cb1dd1d32dda265d9..35f74ed81341800fb0a58d7e20be633e7d1b1bda 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
@@ -704,6 +704,7 @@ public abstract class ChromeActivity extends AsyncInitializationActivity
             });
         }
         if (mCompositorViewHolder != null) mCompositorViewHolder.onStart();
+        mSnackbarManager.onStart();
 
         // Explicitly call checkAccessibility() so things are initialized correctly when Chrome has
         // been re-started after closing due to the last tab being closed when homepage is enabled.
@@ -719,12 +720,7 @@ public abstract class ChromeActivity extends AsyncInitializationActivity
         // We want to refresh partner browser provider every onStart().
         mPartnerBrowserRefreshNeeded = true;
         if (mCompositorViewHolder != null) mCompositorViewHolder.onStop();
-    }
-
-    @Override
-    public void onPause() {
-        super.onPause();
-        mSnackbarManager.dismissAllSnackbars(false);
+        mSnackbarManager.onStop();
     }
 
     @Override