Don't require Mac 10.6 SDK for official iOS builds.
Don't require Mac 10.6 SDK for official iOS builds.

iOS does not have this requirement, but we've been installing the 10.6
SDK on the buildbot slaves to make the 'find_sdk.py --verify' call
happy. However, iossim no longer builds with 10.6 so it's time to update
the mac_sdk_min for iOS to 10.8 and remove the false requirement for
official builds.

BUG=418602

Review URL: https://codereview.chromium.org/660783004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#299904}

dushu1203/chromium.src,Chilledheart/chromium,dednal/chromium.src,hgl888/chromium-crosswalk,jaruba/chromium.src,chuan9/chromium-crosswalk,dednal/chromium.src,dednal/chromium.src,Just-D/chromium-1,Pluto-tv/chromium-crosswalk,ltilve/chromium,fujunwei/chromium-crosswalk,markYoungH/chromium.src,jaruba/chromium.src,fujunwei/chromium-crosswalk,M4sse/chromium.src,Jonekee/chromium.src,M4sse/chromium.src,ltilve/chromium,markYoungH/chromium.src,hgl888/chromium-crosswalk,krieger-od/nwjs_chromium.src,dushu1203/chromium.src,krieger-od/nwjs_chromium.src,dushu1203/chromium.src,Chilledheart/chromium,Jonekee/chromium.src,Jonekee/chromium.src,dushu1203/chromium.src,Fireblend/chromium-crosswalk,hgl888/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,Just-D/chromium-1,TheTypoMaster/chromium-crosswalk,dednal/chromium.src,Jonekee/chromium.src,TheTypoMaster/chromium-crosswalk,chuan9/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,Jonekee/chromium.src,TheTypoMaster/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,markYoungH/chromium.src,ltilve/chromium,Pluto-tv/chromium-crosswalk,chuan9/chromium-crosswalk,fujunwei/chromium-crosswalk,axinging/chromium-crosswalk,ltilve/chromium,Pluto-tv/chromium-crosswalk,axinging/chromium-crosswalk,chuan9/chromium-crosswalk,Jonekee/chromium.src,krieger-od/nwjs_chromium.src,Jonekee/chromium.src,jaruba/chromium.src,Pluto-tv/chromium-crosswalk,Jonekee/chromium.src,Pluto-tv/chromium-crosswalk,hgl888/chromium-crosswalk,dednal/chromium.src,TheTypoMaster/chromium-crosswalk,Just-D/chromium-1,mohamed--abdel-maksoud/chromium.src,jaruba/chromium.src,M4sse/chromium.src,chuan9/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,markYoungH/chromium.src,axinging/chromium-crosswalk,krieger-od/nwjs_chromium.src,Fireblend/chromium-crosswalk,Chilledheart/chromium,Chilledheart/chromium,PeterWangIntel/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,hgl888/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,Just-D/chromium-1,TheTypoMaster/chromium-crosswalk,chuan9/chromium-crosswalk,jaruba/chromium.src,Jonekee/chromium.src,dednal/chromium.src,axinging/chromium-crosswalk,ltilve/chromium,krieger-od/nwjs_chromium.src,PeterWangIntel/chromium-crosswalk,axinging/chromium-crosswalk,Chilledheart/chromium,Just-D/chromium-1,markYoungH/chromium.src,fujunwei/chromium-crosswalk,Fireblend/chromium-crosswalk,dushu1203/chromium.src,fujunwei/chromium-crosswalk,dushu1203/chromium.src,Fireblend/chromium-crosswalk,M4sse/chromium.src,Chilledheart/chromium,krieger-od/nwjs_chromium.src,TheTypoMaster/chromium-crosswalk,fujunwei/chromium-crosswalk,ltilve/chromium,dushu1203/chromium.src,dushu1203/chromium.src,ltilve/chromium,krieger-od/nwjs_chromium.src,Jonekee/chromium.src,Pluto-tv/chromium-crosswalk,dednal/chromium.src,chuan9/chromium-crosswalk,M4sse/chromium.src,mohamed--abdel-maksoud/chromium.src,jaruba/chromium.src,M4sse/chromium.src,hgl888/chromium-crosswalk,Chilledheart/chromium,TheTypoMaster/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,mohamed--abdel-maksoud/chromium.src,markYoungH/chromium.src,fujunwei/chromium-crosswalk,jaruba/chromium.src,markYoungH/chromium.src,krieger-od/nwjs_chromium.src,hgl888/chromium-crosswalk,dushu1203/chromium.src,PeterWangIntel/chromium-crosswalk,M4sse/chromium.src,axinging/chromium-crosswalk,Pluto-tv/chromium-crosswalk,dushu1203/chromium.src,TheTypoMaster/chromium-crosswalk,krieger-od/nwjs_chromium.src,ltilve/chromium,Fireblend/chromium-crosswalk,jaruba/chromium.src,Jonekee/chromium.src,Fireblend/chromium-crosswalk,fujunwei/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,Fireblend/chromium-crosswalk,krieger-od/nwjs_chromium.src,chuan9/chromium-crosswalk,Fireblend/chromium-crosswalk,fujunwei/chromium-crosswalk,M4sse/chromium.src,dednal/chromium.src,dushu1203/chromium.src,mohamed--abdel-maksoud/chromium.src,axinging/chromium-crosswalk,Just-D/chromium-1,hgl888/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,axinging/chromium-crosswalk,M4sse/chromium.src,ltilve/chromium,Fireblend/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,dednal/chromium.src,markYoungH/chromium.src,Pluto-tv/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,markYoungH/chromium.src,M4sse/chromium.src,axinging/chromium-crosswalk,jaruba/chromium.src,axinging/chromium-crosswalk,markYoungH/chromium.src,M4sse/chromium.src,jaruba/chromium.src,dednal/chromium.src,jaruba/chromium.src,Pluto-tv/chromium-crosswalk,dednal/chromium.src,Just-D/chromium-1,Chilledheart/chromium,PeterWangIntel/chromium-crosswalk,chuan9/chromium-crosswalk,hgl888/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,markYoungH/chromium.src,krieger-od/nwjs_chromium.src,axinging/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,Just-D/chromium-1,Just-D/chromium-1,Chilledheart/chromium