Resolve function and variable conflict

When using Jumbo build, there are conflicts between
dashboard_private_api.cc and webstore_private_api.cc.
The conflicts are the variable kUserCancelledError
and the function WebstoreInstallHelperResultToApiResult.
This commit solve the issues by renaming the variable and
function to something more file specific.

Bug: 850484
Change-Id: I600a036505ef731124ac6e4c3ea2f750a50ccad5
Reviewed-on: https://chromium-review.googlesource.com/1098958
Reviewed-by: Ken Rockot <rockot@chromium.org>
Commit-Queue: Oscar Johansson <oscarj@opera.com>
Cr-Commit-Position: refs/heads/master@{#567165}
2 files changed