Fix a bunch of spelling mistakes :\

src/stub-cache-arm.cc

Index: src/stub-cache-arm.cc
diff --git a/src/stub-cache-arm.cc b/src/stub-cache-arm.cc
index 4470822eb0474fd7f94baf8061ca5a1c22894405..732d2922ea9d64ae70a81bd497a71ab1208fd8ec 100644
--- a/src/stub-cache-arm.cc
+++ b/src/stub-cache-arm.cc
@@ -384,7 +384,7 @@ void StubCompiler::GenerateStoreField(MacroAssembler* masm,
   // Perform map transition for the receiver if necessary.
   if ((transition != NULL) && (object->map()->unused_property_fields() == 0)) {
     // The properties must be extended before we can store the value.
-    // We jump to a runtime call that extends the propeties array.
+    // We jump to a runtime call that extends the properties array.
     __ mov(r2, Operand(Handle<Map>(transition)));
     // Please note, if we implement keyed store for arm we need
     // to call the Builtins::KeyedStoreIC_ExtendStorage.