base: Fix warnings found by clang chromium-style plugin on Windows.

base/win/shortcut.cc

Index: base/win/shortcut.cc
diff --git a/base/win/shortcut.cc b/base/win/shortcut.cc
index eb26ceaa4a3f7886ede64aed5d01bcd716bd8c94..207fdbe0a29c66d79ded7f0f0518b0d81665e8d2 100644
--- a/base/win/shortcut.cc
+++ b/base/win/shortcut.cc
@@ -42,6 +42,13 @@ void InitializeShortcutInterfaces(
 
 }  // namespace
 
+ShortcutProperties::ShortcutProperties()
+    : icon_index(-1), dual_mode(false), options(0U) {
+}
+
+ShortcutProperties::~ShortcutProperties() {
+}
+
 bool CreateOrUpdateShortcutLink(const FilePath& shortcut_path,
                                 const ShortcutProperties& properties,
                                 ShortcutOperation operation) {