Fix autosize related bugs in <extensionoptions>

chrome/browser/guest_view/extension_options/extension_options_guest.cc

Index: chrome/browser/guest_view/extension_options/extension_options_guest.cc
diff --git a/chrome/browser/guest_view/extension_options/extension_options_guest.cc b/chrome/browser/guest_view/extension_options/extension_options_guest.cc
index 3ca78ecfec820868a02aace06a3c3d6843d8e715..f41cc801c19d4462eba57ce06dce40c797642f0e 100644
--- a/chrome/browser/guest_view/extension_options/extension_options_guest.cc
+++ b/chrome/browser/guest_view/extension_options/extension_options_guest.cc
@@ -154,7 +154,7 @@ bool ExtensionOptionsGuest::IsAutoSizeSupported() const {
 
 void ExtensionOptionsGuest::SetUpAutoSize() {
   // Read the autosize parameters passed in from the embedder.
-  bool auto_size_enabled;
+  bool auto_size_enabled = false;
   extra_params()->GetBoolean(extensionoptions::kAttributeAutoSize,
                              &auto_size_enabled);