[Payments] Remove the tooltip icon from the Card Unmask dialog

If was considered redundant by UX designer and writer.

Bug: 850571
Test: ./out/Default/browser_tests --gtest_filter=BrowserUiTest.Invoke --ui=CardUnmaskPromptViewBrowserTest.InvokeUi_valid_PermanentError --test-launcher-intera
Change-Id: I3630fabdc7cabec92106d75ed907faa1b72a64b1
Reviewed-on: https://chromium-review.googlesource.com/1107778Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Mathieu Perreault <mathp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569040}

chrome/browser/ui/views/autofill/card_unmask_prompt_views.cc

@@ -31,7 +31,6 @@
 #include "ui/native_theme/native_theme.h"
 #include "ui/views/background.h"
 #include "ui/views/border.h"
-#include "ui/views/bubble/tooltip_icon.h"
 #include "ui/views/controls/button/checkbox.h"
 #include "ui/views/controls/combobox/combobox.h"
 #include "ui/views/controls/image_view.h"
@@ -219,12 +218,6 @@ views::View* CardUnmaskPromptViews::CreateFootnoteView() {
   storage_row_->AddChildView(storage_checkbox_);
   storage_row_layout->SetFlexForView(storage_checkbox_, 1);
 
-  views::TooltipIcon* icon = new views::TooltipIcon(l10n_util::GetStringUTF16(
-      IDS_AUTOFILL_CARD_UNMASK_PROMPT_STORAGE_TOOLTIP));
-  const int kTooltipWidth = 233;
-  icon->set_bubble_width(kTooltipWidth);
-  storage_row_->AddChildView(icon);
-
   return storage_row_;
 }