Cleans up gyp file for views example and removes duplicate code

ui/views/views.gyp

Index: ui/views/views.gyp
diff --git a/ui/views/views.gyp b/ui/views/views.gyp
index 9b57b95431ca729bf3e892e6685ad9eed4769315..e0d5f0d40400266334efec19bca2a9b6b75fdc5e 100644
--- a/ui/views/views.gyp
+++ b/ui/views/views.gyp
@@ -993,6 +993,7 @@
         '../ui.gyp:ui',
         'controls/webview/webview.gyp:webview',
         'views',
+        'views_examples_lib',
       ],
       'include_dirs': [
         '..',
@@ -1001,59 +1002,11 @@
         'VIEWS_EXAMPLES_WITH_CONTENT_IMPLEMENTATION',
       ],
       'sources': [
-        'examples/bubble_example.cc',
-        'examples/bubble_example.h',
-        'examples/button_example.cc',
-        'examples/button_example.h',
-        'examples/checkbox_example.cc',
-        'examples/checkbox_example.h',
-        'examples/combobox_example.cc',
-        'examples/combobox_example.h',
-        'examples/double_split_view_example.cc',
-        'examples/double_split_view_example.h',
-        'examples/example_base.cc',
-        'examples/example_base.h',
-        'examples/example_combobox_model.cc',
-        'examples/example_combobox_model.h',
         'examples/examples_window_with_content.cc',
         'examples/examples_window_with_content.h',
-        'examples/label_example.cc',
-        'examples/label_example.h',
-        'examples/link_example.cc',
-        'examples/link_example.h',
-        'examples/message_box_example.cc',
-        'examples/message_box_example.h',
-        'examples/menu_example.cc',
-        'examples/menu_example.h',
-        'examples/multiline_example.cc',
-        'examples/multiline_example.h',
-        'examples/progress_bar_example.cc',
-        'examples/progress_bar_example.h',
-        'examples/radio_button_example.cc',
-        'examples/radio_button_example.h',
-        'examples/scroll_view_example.cc',
-        'examples/scroll_view_example.h',
-        'examples/single_split_view_example.cc',
-        'examples/single_split_view_example.h',
-        'examples/slider_example.cc',
-        'examples/slider_example.h',
-        'examples/tabbed_pane_example.cc',
-        'examples/tabbed_pane_example.h',
-        'examples/table_example.cc',
-        'examples/table_example.h',
-        'examples/text_example.cc',
-        'examples/text_example.h',
-        'examples/textfield_example.cc',
-        'examples/textfield_example.h',
-        'examples/throbber_example.cc',
-        'examples/throbber_example.h',
-        'examples/tree_view_example.cc',
-        'examples/tree_view_example.h',
         'examples/views_examples_with_content_export.h',
         'examples/webview_example.cc',
         'examples/webview_example.h',
-        'examples/widget_example.cc',
-        'examples/widget_example.h',
       ],
       'conditions': [
         ['OS=="win"', {