Print preview page selection should not require a rerendering of draft pages.

Reland 96406 - Print preview page selection should not require a rerendering of draft pages. 

On page selection, regenerate the complete document with the selection, but preserve the existing draft pages and simply display a subset of them. 

1. Added a new param |clear all preview data| to |PrintHostMsg_DidGetPreviewPageCount|. 
2. Removed |requested_preview_page_index| from |PrintMsg_ContinuePreview| 

Review URL: http://codereview.chromium.org/7544018

Original Commit: http://src.chromium.org/viewvc/chrome?view=rev&revision=96406

Revert Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=96414

BUG=84383
TEST=print preview works after code changes.

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=96567