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 ebeaa204310acaa03315acf923299d2d42d859a5..deb7cf8624dc0f850ee419d33746b42622fe418b 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
@@ -723,6 +723,7 @@ 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.
@@ -738,12 +739,7 @@ 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