Bump iossim default device to 'iPhone 5s'.

testing/iossim/iossim.mm

Index: testing/iossim/iossim.mm
diff --git a/testing/iossim/iossim.mm b/testing/iossim/iossim.mm
index 83cfe9274c9b280dd46f49ef1ee65add4e0deb5d..2f2af8d239ec0e995a382bfb3485d0ee20b8bd4d 100644
--- a/testing/iossim/iossim.mm
+++ b/testing/iossim/iossim.mm
@@ -850,7 +850,8 @@ int main(int argc, char* const argv[]) {
   NSString* appPath = nil;
   NSString* appName = nil;
   NSString* sdkVersion = nil;
-  NSString* deviceName = IsRunningWithXcode6OrLater() ? @"iPhone 5" : @"iPhone";
+  NSString* deviceName =
+      IsRunningWithXcode6OrLater() ? @"iPhone 5s" : @"iPhone";
   NSString* simHomePath = nil;
   NSMutableArray* appArgs = [NSMutableArray array];
   NSMutableDictionary* appEnv = [NSMutableDictionary dictionary];