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|(element.Form() == generation_element_.Form())| in PasswordGenerationAgent::TextDidChangeInTextField causes a crash. |element| or |generation_element_| is null.

Probable reason: That code assumes that |generation_element_| must be non-null if |password_is_generated_| is true. But in PasswordGenerationAgent::DidCommitProvisionalLoad, |generation_element_| is cleared while |password_is_generated_| stays the same. So, it is possible that |generation_element_| is null while |password_is_generated_| is true.

TBR=dvadym@, vasilii@, ioanap@
Bug: 879713

Change-Id: I4b8a42ab8aebb1474f7a3b57c9fa63ab15dcd610
Reviewed-on: https://chromium-review.googlesource.com/1200642
Commit-Queue: Maxim Kolosovskiy <kolos@chromium.org>
Reviewed-by: Maxim Kolosovskiy <kolos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588277}