Fix flakyness with TextfieldViewsModelTest.Clipboard.

Set the clipboard text initially rather than using
whatever happened to be in the clipboard at the time
of the test.

BUG=none
TEST=Copy some non-ASCII text before running TextfieldViewsModelTest.Clipboard.
Then, run the test. It should not fail.

Review URL: http://codereview.chromium.org/8486024

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110434 0039d316-1c4b-4281-b951-d872f2087c98

views/controls/textfield/textfield_views_model_unittest.cc

@@ -510,8 +510,9 @@ TEST_F(TextfieldViewsModelTest, SetText) {
 TEST_F(TextfieldViewsModelTest, MAYBE_Clipboard) {
   ui::Clipboard* clipboard
       = views::ViewsDelegate::views_delegate->GetClipboard();
-  string16 initial_clipboard_text;
-  clipboard->ReadText(ui::Clipboard::BUFFER_STANDARD, &initial_clipboard_text);
+  string16 initial_clipboard_text = ASCIIToUTF16("initial text");
+  ui::ScopedClipboardWriter(clipboard).WriteText(initial_clipboard_text);
+
   string16 clipboard_text;
   TextfieldViewsModel model(NULL);
   model.Append(ASCIIToUTF16("HELLO WORLD"));