[chrome-devtools-frontend] Migrate to cloudstorage client
Import the cloudstorage library into the project to replace deprecated
'files' API.
Change pre_cacher module to populate local Cloud Storage server instead
of the cache.
file_reader module now relies on cloudstorage library's retries mechanism
instead of doing retries on its own.
TBR=pfeldman@chromium.org
Review URL: https://codereview.chromium.org/1150463002
git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/chrome-devtools-frontend@295320 0039d316-1c4b-4281-b951-d872f2087c98
13 files changed