Disable all the tests that are flaking more than 5% on Linux builders.

ui/views/controls/textfield/textfield_unittest.cc

Index: ui/views/controls/textfield/textfield_unittest.cc
diff --git a/ui/views/controls/textfield/textfield_unittest.cc b/ui/views/controls/textfield/textfield_unittest.cc
index d7cfa72ed703002bdaff7cddd26b967d6573b872..b3f4d24d7c1abb3f9ef8bd825f4e53dc110d6d96 100644
--- a/ui/views/controls/textfield/textfield_unittest.cc
+++ b/ui/views/controls/textfield/textfield_unittest.cc
@@ -1807,7 +1807,8 @@ TEST_F(TextfieldTest, KeepInitiallySelectedWord) {
 }
 
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
-TEST_F(TextfieldTest, SelectionClipboard) {
+// flaky: http://crbug.com/396477
+TEST_F(TextfieldTest, DISABLED_SelectionClipboard) {
   InitTextfield();
   textfield_->SetText(ASCIIToUTF16("0123"));
   gfx::Point point_1(GetCursorPositionX(1), 0);