bug 997564 - add a call path for engineering mode in Gaia
Bug 1040875 - Warning about failure to parse CSS value in delete messages view. r=azasypkin
Merge pull request #22302 from evelynhung/issue-997564

bug 997564 - add a call path for engineering mode in Gaia. r=anthony
Merge pull request #24378 from kumarrishav/Bug-1040875

Bug 1040875 - Warning about failure to parse CSS value in delete messages view. r=azasypkin
Update links to fetch shared style from default theme.