views::Label displaying the tooltip should not elide.

The default eliding behavior on views::Label was changed to ELIDE_AT_END in
https://codereview.chromium.org/14654018 which make tooltips display incorrectly
in chromeos.

BUG=none
TEST=manual: trigger a long tooltip (one that cannot fit in one line). For
example, hover over the tab of any page with a long title (try the codereview
link above). Without this change, the tooltip label appears as a single line
elided at the end and has a weird size.

Review URL: https://chromiumcodereview.appspot.com/15772002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@202039 0039d316-1c4b-4281-b951-d872f2087c98

ui/views/corewm/tooltip_controller.cc

@@ -98,6 +98,7 @@ class TooltipController::Tooltip : public views::WidgetObserver {
                                            kTooltipBorder));
     }
     label_.set_owned_by_client();
+    label_.SetMultiLine(true);
   }
 
   virtual ~Tooltip() {
@@ -119,7 +120,7 @@ class TooltipController::Tooltip : public views::WidgetObserver {
     label_.SetText(trimmed_text);
 
     int width = max_width + 2 * kTooltipHorizontalPadding;
-    int height = label_.GetPreferredSize().height() +
+    int height = label_.GetHeightForWidth(max_width) +
         2 * kTooltipVerticalPadding;
     if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kNoDropShadows)) {
       width += 2 * kTooltipBorderWidth;