kStopIcon is a constant in the OSX APIs so rename kGenericStopIcon

Jumbo Mac fyi builder broke when a kStopIcon was introduced in
https://chromium-review.googlesource.com/c/chromium/src/+/1239010
because the OSX API has a kStopIcon in
.../MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk/System/Library/Frameworks/Carbon.framework/Frameworks/HIToolbox.framework/Headers/Dialogs.h

This renames it to kGenericStopIcon to make the builds go again.

TBR=jrw@chromium.org,estade@chromium.org

Bug: 877702
Change-Id: Id6c675b539f8e3161ef322bf008174ec2911d4be
Reviewed-on: https://chromium-review.googlesource.com/c/1261042Reviewed-by: Daniel Bratell <bratell@opera.com>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#596571}

chrome/app/vector_icons/BUILD.gn

@@ -51,6 +51,7 @@ aggregate_vector_icons("chrome_vector_icons") {
     "folder.icon",
     "folder_supervised.icon",
     "forward_arrow_touch.icon",
+    "generic_stop.icon",
     "globe.icon",
     "google_pay_logo.icon",
     "horizontal_menu.icon",
@@ -87,7 +88,6 @@ aggregate_vector_icons("chrome_vector_icons") {
     "smartphone.icon",
     "speaker.icon",
     "speaker_group.icon",
-    "stop.icon",
     "supervisor_account.icon",
     "supervisor_account_circle.icon",
     "sync.icon",

chrome/browser/ui/views/media_router/cast_dialog_sink_button.cc

@@ -38,8 +38,8 @@ class StopButton : public views::LabelButton {
              int button_tag,
              bool enabled)
       : views::LabelButton(button_listener, base::string16()) {
-    static const gfx::ImageSkia icon =
-        CreateVectorIcon(kStopIcon, kPrimaryIconSize, gfx::kGoogleBlue500);
+    static const gfx::ImageSkia icon = CreateVectorIcon(
+        kGenericStopIcon, kPrimaryIconSize, gfx::kGoogleBlue500);
     SetImage(views::Button::STATE_NORMAL, icon);
     SetInkDropMode(views::InkDropHostView::InkDropMode::ON);
     set_tag(button_tag);