PageInfoPopup.java:
- addDescriptionSection(): Remove
- addSection(): Modify
  - Check for has_certificate. If true:
    - call addCertificateViewer()
    - Save mCertificateLayout for addResetCertDecisionsButton()
- setCertificateViewer(): Change to addCertificateViewer(ViewGroup layout, String label)
- addResetCertDecisionsButton(): Keep
  - Add to mCertificateLayout (part of the connection explanation) instead of mContainer (as a top-level bullet).
- Audit for unneeded member variables.

C++
- Add SecurityStyleExplanations to IdentityInfo
- In PageInfo::PresentSiteIdentity(), use web_contents()->GetDelegate()->GetSecurityStyle() to set info.security_style_explanations (with localize set to true)
- In ConnectionInfoPopupAndroid::SetIdentityInfo, iterate over each list of explanations and call Java_ConnectionInfoPopup_addSection() for each explanation.