Left-align body text in Caret Browsing dialog

This looks better and better matches the mock.

Bug: 1108114
Change-Id: I7f31c856bfe66b7d3fb4d4ae277ac633e8517295
AX-Relnotes: N/A
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2357855
Auto-Submit: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798517}

chrome/browser/ui/views/accessibility/caret_browsing_dialog_delegate.cc

@@ -48,6 +48,7 @@ CaretBrowsingDialogDelegate::CaretBrowsingDialogDelegate(
 
   auto* message_label = AddChildView(std::make_unique<views::Label>(
       message_text, views::style::CONTEXT_MESSAGE_BOX_BODY_TEXT));
+  message_label->SetHorizontalAlignment(gfx::ALIGN_LEFT);
   message_label->SetMultiLine(true);
 
   do_not_ask_checkbox_ = AddChildView(std::make_unique<views::Checkbox>(