*Remove obsolete code for Arcane Blast

*Reduce amount of auras removed at arena match start.

--HG--
branch : trunk

src/game/BattleGround.cpp

@@ -410,7 +410,11 @@ void BattleGround::Update(uint32 diff)
                         Unit::AuraMap & aurMap = plr->GetAuras();
                         for(Unit::AuraMap::iterator iter = aurMap.begin(); iter != aurMap.end();)
                         {
-                            if (iter->second->GetAuraDuration()<=30*IN_MILISECONDS)
+                            if (!iter->second->IsPermanent()
+                                && iter->second->GetAuraDuration()<=30*IN_MILISECONDS
+                                && iter->second->IsPositive()
+                                && (!(iter->second->GetSpellProto()->Attributes & SPELL_ATTR_UNAFFECTED_BY_INVULNERABILITY))
+                                && (!iter->second->IsAuraType(SPELL_AURA_MOD_INVISIBILITY)))
                             {
                                 plr->RemoveAura(iter);
                             }

src/game/SpellEffects.cpp

@@ -423,15 +423,6 @@ void Spell::SpellDamageSchoolDmg(uint32 effect_idx)
                 break;
             }
 
-            case SPELLFAMILY_MAGE:
-            {
-                // Arcane Blast
-                if(m_spellInfo->SpellFamilyFlags[0] & 0x20000000)
-                {
-                    m_caster->CastSpell(m_caster,36032,true);
-                }
-                break;
-            }
             case SPELLFAMILY_WARRIOR:
             {
                 // Bloodthirst