Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_4/rev/2ab5c8723873
Author: evelynhung <jj.evelyn@gmail.com>
Desc: Merge pull request #22382 from crh0716/1046068

Bug 1046068 - Add the default value for mms delivery report
Bumping manifests a=b2g-bump
Bumping manifests a=b2g-bump
Bug 1044205 - Detach the XPCWrappedNativeScope from the CompartmentPrivate during forcible shutdown. r=billm
Bug 1044205 - Invoke XPCWrappedNativeScope::TraceSelf from TraceXPCGlobal. r=billm
Bug 1044205 - Rename XPCWrappedNativeScope::TraceSelf to TraceInside. r=billm a=1.4+
Bug 1038046 - [RTSP] RTSP cannot play some H263 video streaming. r=sworkman, a=1.4+
Bug 1039185 - Always Check 'x-mms-read-report' before trying to send read report. r=vyang, a=1.4+