Rename buildflag_headers for consistency

This updates ui/base/ui_features

Targets go from foo_features to foo_buildflags
And similarly the header now has buildflags in the name.

BUG=814485
TEST=covered by build

Change-Id: Ia06811589cbaf18daab4c67048096875fb25cf3e
Reviewed-on: https://chromium-review.googlesource.com/c/1403088
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#621329}

• chrome/browser/apps/guest_view/web_view_interactive_browsertest.cc[diff]
• chrome/browser/chrome_content_browser_client.cc[diff]
• chrome/browser/extensions/api/extension_action/browser_action_interactive_test.cc[diff]
• chrome/browser/extensions/dev_mode_bubble_delegate.cc[diff]
• chrome/browser/global_keyboard_shortcuts_mac_unittest.mm[diff]
• chrome/browser/media/router/BUILD.gn[diff]
• chrome/browser/media/router/media_router_feature.cc[diff]
• chrome/browser/notifications/notification_display_service_tester.cc[diff]
• chrome/browser/safe_browsing/chrome_password_protection_service.h[diff]
• chrome/browser/ui/hung_renderer/hung_renderer_interactive_uitest.cc[diff]
• chrome/browser/ui/startup/startup_browser_creator_impl.cc[diff]
• chrome/browser/ui/views/autofill/autofill_popup_base_view.cc[diff]
• chrome/browser/ui/views/confirm_bubble_views.cc[diff]
• chrome/browser/ui/views/download/download_danger_prompt_views.cc[diff]
• chrome/browser/ui/views/extensions/extension_installed_bubble_view.cc[diff]
• chrome/browser/ui/views/global_error_bubble_view.cc[diff]
• chrome/browser/ui/views/hats/hats_bubble_view.cc[diff]
• chrome/browser/ui/views/importer/import_lock_dialog_view.cc[diff]
• chrome/browser/ui/views/page_info/page_info_bubble_view_base.cc[diff]
• chrome/browser/ui/views/relaunch_notification/relaunch_recommended_bubble_view.cc[diff]
• chrome/browser/ui/views/session_crashed_bubble_view.cc[diff]
• chrome/browser/ui/views/session_crashed_bubble_view_browsertest.cc[diff]
• chrome/browser/ui/views/ssl_client_certificate_selector_mac.mm[diff]
• chrome/common/BUILD.gn[diff]
• chrome/common/chrome_features.h[diff]
• chrome/common/chrome_switches.h[diff]
• chrome/test/base/interactive_test_utils_views.cc[diff]
• chrome/utility/BUILD.gn[diff]
• chrome/utility/chrome_content_utility_client.cc[diff]
• components/exo/wayland/server.cc[diff]
• components/exo/wayland/wayland_keyboard_delegate.h[diff]
• components/test/components_test_suite.cc[diff]
• content/browser/BUILD.gn[diff]
• content/browser/browser_main_loop.h[diff]
• content/browser/service_manager/service_manager_context.cc[diff]
• content/ppapi_plugin/ppapi_thread.cc[diff]
• content/public/test/test_launcher.cc[diff]
• content/test/content_test_launcher.cc[diff]
• extensions/test/extensions_unittests_main.cc[diff]
• ui/accessibility/platform/ax_platform_node.cc[diff]
• ui/accessibility/platform/ax_platform_node_base.h[diff]
• ui/aura/BUILD.gn[diff]
• ui/aura/test/aura_test_suite_setup.h[diff]
• ui/base/BUILD.gn[diff]
• ui/base/material_design/material_design_controller.cc[diff]
• ui/base/resource/resource_bundle.cc[diff]
• ui/base/ui_base_features.h[diff]
• ui/events/keycodes/BUILD.gn[diff]
• ui/events/keycodes/DEPS[diff]
• ui/events/keycodes/xkb_keysym.h[diff]
• ui/ozone/platform/drm/DEPS[diff]
• ui/ozone/platform/drm/ozone_platform_gbm.cc[diff]
• ui/ozone/platform/wayland/BUILD.gn[diff]
• ui/ozone/platform/wayland/DEPS[diff]
• ui/ozone/platform/wayland/ozone_platform_wayland.cc[diff]
• ui/ozone/platform/wayland/wayland_keyboard.cc[diff]
• ui/ozone/platform/wayland/wayland_test.h[diff]
• ui/ozone/platform/wayland/wayland_touch.cc[diff]
• ui/views/accessibility/view_accessibility.cc[diff]
• ui/views/style/platform_style_mac.mm[diff]