[privacy view] Use app list color provider for text color.

The text color is currently set to a dark shade of grey. However,
devices with dark launchers can have dark backgrounds and this makes the
dark grey text unreadable. This CL updates the text color to be
determined by the app list color provider instead, which will take into
account the dark or light theme of the launcher.

Bug: 1079169
Change-Id: Ica64fffb6e7f83b1e028088af4649c470c4f36fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2437075Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Rachel Wong <wrong@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811889}

ash/app_list/views/privacy_info_view.cc

@@ -7,6 +7,7 @@
 #include <memory>
 #include <utility>
 
+#include "ash/public/cpp/app_list/app_list_color_provider.h"
 #include "base/bind.h"
 #include "ui/accessibility/ax_action_data.h"
 #include "ui/accessibility/ax_enums.mojom.h"
@@ -285,7 +286,7 @@ void PrivacyInfoView::InitText() {
       ax::mojom::Role::kGenericContainer);
 
   views::StyledLabel::RangeStyleInfo style;
-  style.override_color = gfx::kGoogleGrey900;
+  style.override_color = AppListColorProvider::Get()->GetSearchBoxTextColor();
   text_view_->AddStyleRange(gfx::Range(0, offset), style);
 
   // Create a custom view for the link portion of the text. This allows an