[stubs] Remove unused StoreGlobalViaContextStub.

src/arm/interface-descriptors-arm.cc

Index: src/arm/interface-descriptors-arm.cc
diff --git a/src/arm/interface-descriptors-arm.cc b/src/arm/interface-descriptors-arm.cc
index a002b8d44aaa7350170f096ff2f42410cddc91ab..ecd7a762ff8de7193fa0a0ca2bc09896f9f65791 100644
--- a/src/arm/interface-descriptors-arm.cc
+++ b/src/arm/interface-descriptors-arm.cc
@@ -46,10 +46,6 @@ const Register StoreTransitionDescriptor::SlotRegister() { return r4; }
 const Register StoreTransitionDescriptor::VectorRegister() { return r3; }
 const Register StoreTransitionDescriptor::MapRegister() { return r5; }
 
-const Register StoreGlobalViaContextDescriptor::SlotRegister() { return r2; }
-const Register StoreGlobalViaContextDescriptor::ValueRegister() { return r0; }
-
-
 const Register StringCompareDescriptor::LeftRegister() { return r1; }
 const Register StringCompareDescriptor::RightRegister() { return r0; }