Move third_party/html_office to chrome/browser/resources/pdf

This moves third_party/html_office to chrome/browser/resources/pdf. Currently
html_office is only used by the pdf component extension, it isn't third_party
code and it's more difficult to use the code from it's current location.
The repo is also still empty so this shouldn't result in a lot of dwarf files.

BUG=303491

Review URL: https://codereview.chromium.org/131643003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245442 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245443 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 245443