Fix some nits in chrome_pdf::DocumentLoader.

Add helper functions to make code more readable as well.

Change-Id: I45fce08e091ca26d9eed0289416a3cd4b8261ffd
Reviewed-on: https://chromium-review.googlesource.com/982649
Reviewed-by: dsinclair <[email protected]>
Commit-Queue: Lei Zhang <[email protected]>
Cr-Commit-Position: refs/heads/master@{#546528}
3 files changed