Don't subtract border from max size for display rect.

ui/views/corewm/tooltip_aura.cc

Index: ui/views/corewm/tooltip_aura.cc
diff --git a/ui/views/corewm/tooltip_aura.cc b/ui/views/corewm/tooltip_aura.cc
index 256a4fbfebb78e00a78dce44c0024e6939d722ad..00c831c56f7001515f3457029a803e7637e847d2 100644
--- a/ui/views/corewm/tooltip_aura.cc
+++ b/ui/views/corewm/tooltip_aura.cc
@@ -13,6 +13,7 @@
 #include "ui/display/screen.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/render_text.h"
+#include "ui/gfx/test/render_text_test_api.h"
 #include "ui/gfx/text_elider.h"
 #include "ui/gfx/text_utils.h"
 #include "ui/native_theme/native_theme.h"
@@ -141,11 +142,13 @@ class TooltipAura::TooltipView : public views::View {
     ResetDisplayRect();
   }
 
+  size_t GetLineSizeForTest() {
+    return gfx::test::RenderTextTestApi(render_text_.get()).lines().size();
+  }
+
  private:
   void ResetDisplayRect() {
-    gfx::Insets insets = border()->GetInsets();
-    int max_text_width = max_width_ - insets.width();
-    render_text_->SetDisplayRect(gfx::Rect(0, 0, max_text_width, 100000));
+    render_text_->SetDisplayRect(gfx::Rect(0, 0, max_width_, 100000));
   }
 
   std::unique_ptr<gfx::RenderText> render_text_;
@@ -164,6 +167,10 @@ TooltipAura::~TooltipAura() {
   DestroyWidget();
 }
 
+size_t TooltipAura::GetLineSizeForTest() {
+  return tooltip_view_->GetLineSizeForTest();
+}
+
 void TooltipAura::SetTooltipBounds(const gfx::Point& mouse_pos,
                                    const gfx::Size& tooltip_size) {
   gfx::Rect tooltip_rect(mouse_pos, tooltip_size);