Make chrome_plugin_host.cc and chrome_plugin_util.cc compile on Posix.

chrome/browser/modal_html_dialog_delegate.cc

Index: chrome/browser/modal_html_dialog_delegate.cc
===================================================================
--- chrome/browser/modal_html_dialog_delegate.cc	(revision 10402)
+++ chrome/browser/modal_html_dialog_delegate.cc	(working copy)
@@ -45,9 +45,9 @@
   return params_.url;
 }
 
-void ModalHtmlDialogDelegate::GetDialogSize(CSize* size) const {
-  size->cx = params_.width;
-  size->cy = params_.height;
+void ModalHtmlDialogDelegate::GetDialogSize(gfx::Size* size) const {
+  size->set_width(params_.width);
+  size->set_height(params_.height);
 }
 
 std::string ModalHtmlDialogDelegate::GetDialogArgs() const {