Use auth/drive scope, instead of auth/drive.file scope

For full access to Drive, we need less restrictive scope.
https://www.googleapis.com/auth/drive.file only allows accessing files
which is created on its own (i.e. Chrome), which is useless for
file browser purpose. Instead, we have to use
https://www.googleapis.com/auth/drive scope.

BUG=chromium:127728
TEST=none

Review URL: https://chromiumcodereview.appspot.com/10832201

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150518 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/chromeos/gdata/operations_base.cc

@@ -50,7 +50,7 @@ const char kUserContentScope[] = "https://docs.googleusercontent.com/";
 const char kContactsScope[] = "https://www.google.com/m8/feeds/";
 
 // OAuth scope for Drive API.
-const char kDriveScope[] = "https://www.googleapis.com/auth/drive.file";
+const char kDriveScope[] = "https://www.googleapis.com/auth/drive";
 const char kDriveAppsScope[] = "https://www.googleapis.com/auth/drive.apps";
 const char kDriveAppsReadonlyScope[] =
     "https://www.googleapis.com/auth/drive.apps.readonly";