Make the webstore inline install dialog be tab-modal

Also clean up a few minor lint errors while I'm in here.

BUG=550047

Review URL: https://codereview.chromium.org/1496033003

Cr-Commit-Position: refs/heads/master@{#363925}
void ExpandableContainerView::LinkClicked(
    views::Link* source, int event_flags) {
  ToggleDetailLevel();
}

void ExpandableContainerView::LinkClicked(
    views::Link* source, int event_flags) {
  ToggleDetailLevel();
}
