Fix a minor typo in password_manager.h

A space between two sentences was missing in a comment, so this CL adds it.

Bug: 795462

Change-Id: Iaa1e92b411f919e34cd8a3737dcd289f85fecdf6
Reviewed-on: https://chromium-review.googlesource.com/1125660
Commit-Queue: Vaclav Brozek <vabr@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572515}

components/password_manager/core/browser/password_manager.h

@@ -124,7 +124,7 @@ class PasswordManager : public LoginModel, public FormSubmissionObserver {
   // Handles a password form being submitted, assumes that submission is
   // successful and does not do any checks on success of submission.
   // For example, this is called if |password_form| was filled
-  // upon in-page navigation.This often means history.pushState being
+  // upon in-page navigation. This often means history.pushState being
   // called from JavaScript.
   void OnPasswordFormSubmittedNoChecks(
       password_manager::PasswordManagerDriver* driver,