Do not break lines when width is not specified.

ui/views/controls/label_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/controls/label.h"
 
 #include "base/i18n/rtl.h"
 #include "base/strings/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/accessibility/ax_view_state.h"
@@ skipping 340 matching lines @@
   label.SetText(ASCIIToUTF16("Too Wide."));
 
   // Check that Label can be laid out at a variety of small sizes,
   // splitting the words into up to one character per line if necessary.
   // Incorrect word splitting may cause infinite loops in text layout.
   gfx::Size required_size = label.GetPreferredSize();
   for (int i = 1; i < required_size.width(); ++i)
     EXPECT_GT(label.GetHeightForWidth(i), 0);
 }
 
+// Verifies if SetAllowCharacterBreak(true) doesn't change the preferred size.
+// See crbug.com/469559
+TEST_F(LabelTest, PreferredSizeForAllowCharacterBreak) {
+  Label label(base::ASCIIToUTF16("Example"));
+  gfx::Size preferred_size = label.GetPreferredSize();
+
+  label.SetMultiLine(true);
+  label.SetAllowCharacterBreak(true);
+  EXPECT_EQ(preferred_size, label.GetPreferredSize());
+}
+
 TEST_F(LabelTest, MultiLineSizing) {
   Label label;
   label.SetFocusable(false);
   label.SetText(
       ASCIIToUTF16("A random string\nwith multiple lines\nand returns!"));
   label.SetMultiLine(true);
 
   // GetPreferredSize
   gfx::Size required_size = label.GetPreferredSize();
   EXPECT_GT(required_size.height(), kMinTextDimension);
@@ skipping 264 matching lines @@
   label()->SetFocusable(true);
   label()->RequestFocus();
   label()->SizeToPreferredSize();
 
   gfx::Rect focus_bounds = label()->GetFocusBounds();
   EXPECT_FALSE(focus_bounds.IsEmpty());
   EXPECT_LT(label()->font_list().GetHeight(), focus_bounds.height());
 }
 
 }  // namespace views