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There is no need to keep the file descriptor open in net_internals_ui.cc as libdbus duplicates the FD when appropriate.

Use base::File instead of PlatformFile.
Use blocking pool instead of WorkerPool.

BUG=369183
TEST=Can save debug logs in "Chrome OS" section of chrome://net-internals on a Chromebook.

Review URL: https://codereview.chromium.org/270853002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269540 0039d316-1c4b-4281-b951-d872f2087c98