Restore SnapshotTabHelper temporarily

chrome/common/chrome_content_client.cc

Index: chrome/common/chrome_content_client.cc
diff --git a/chrome/common/chrome_content_client.cc b/chrome/common/chrome_content_client.cc
index 0bcc7a318ab2c27213f35ee5e4fe0b586b544f6b..aaee0d8ef176ce770d5db3a19556696da71bcf4d 100644
--- a/chrome/common/chrome_content_client.cc
+++ b/chrome/common/chrome_content_client.cc
@@ -399,6 +399,12 @@ bool ChromeContentClient::CanHandleWhileSwappedOut(
   // Any Chrome-specific messages (apart from those listed in
   // CanSendWhileSwappedOut) that must be handled by the browser when sent from
   // swapped out renderers.
+  switch (msg.type()) {
+    case ChromeViewHostMsg_Snapshot::ID:
+      return true;
+    default:
+      break;
+  }
   return false;
 }