Bug 848539 part 1: Back out ed5120ffd118 from bug 794748 (mochitest for min-width:auto). r=dbaron
Bug 848539 part 2: Back out de6a5c46a8ff, bug 666041 part 8 (special-handling for min-width:auto as min-content, for flex items). r=dbaron
Bug 848539 part 3: Back out part of 076d87bf30d0, bug 666041 part 7 (flexbox frame class impl -- just removing the code that deals with min-height:auto). r=dbaron
Bug 848539 part 4: Back out 82f73bdb2237, bug 763689 part 3 (style-system handling for min-height:auto). r=dbaron
Bug 848539 part 5: Back out 6bb37077d615, bug 763689 part 2 (style-system handling for min-width:auto). r=dbaron
Bug 848539 part 6: Back out ff0658329dbd, bug 763689 part 1 (CSS parser support for min-width:auto & min-height:auto). r=dbaron
Bug 848539 part 7: Fix or disable reftests that depend on min-width:auto / min-height:auto. r=dbaron