Add ZipReader::OpenFromString().
This change adds a function OpenFromString to the ZipReader class so we can extract files from a zip archive stored in memory without using temporary files. 

BUG=47083
TEST=ZipReaderTest.OpenFromString.

Review URL: https://chromiumcodereview.appspot.com/10908067

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@160790 0039d316-1c4b-4281-b951-d872f2087c98
5 files changed