Move requests from GroupedPermissionInfoBarDelegate to PermissionPromptAndroid

This patch moves the Vector<PermissionRequest> stored in
GroupedPermissionInfoBarDelegate to PermissionPromptAndroid. This will
allow us to later share the PermissionPromptAndroid class in
PermissionDialogDelegate as storage for this same vector, as we already
will need such a pointer to delegate the the user action callbacks.

BUG=606138
TBR=dfalcantara

Review-Url: https://codereview.chromium.org/2757483002
Cr-Commit-Position: refs/heads/master@{#460005}
5 files changed