aura: Allow creating content_shell without views.

content/content_shell.gypi

Index: content/content_shell.gypi
diff --git a/content/content_shell.gypi b/content/content_shell.gypi
index 6c0f624845dc7d6039d38308af48d33407fa1150..e6cdd954813254dc05238fd4c1870e8714aedeb0 100644
--- a/content/content_shell.gypi
+++ b/content/content_shell.gypi
@@ -129,6 +129,7 @@
         'shell/browser/shell_speech_recognition_manager_delegate.h',
         'shell/browser/shell_url_request_context_getter.cc',
         'shell/browser/shell_url_request_context_getter.h',
+        'shell/browser/shell_views.cc',
         'shell/browser/shell_web_contents_view_delegate_android.cc',
         'shell/browser/shell_web_contents_view_delegate_creator.h',
         'shell/browser/shell_web_contents_view_delegate_gtk.cc',
@@ -217,15 +218,33 @@
           'dependencies': [
             '../ui/aura/aura.gyp:aura',
             '../ui/base/strings/ui_strings.gyp:ui_strings',
-            '../ui/views/controls/webview/webview.gyp:webview',
-            '../ui/views/views.gyp:views',
-            '../ui/views/views.gyp:views_test_support',
-            '../ui/ui.gyp:ui_resources',
           ],
           'sources/': [
             ['exclude', 'shell/browser/shell_gtk.cc'],
             ['exclude', 'shell/browser/shell_win.cc'],
           ],
+          'conditions': [
+            ['toolkit_views==1', {
+              'dependencies': [
+                '../ui/views/controls/webview/webview.gyp:webview',
+                '../ui/views/views.gyp:views',
+                '../ui/views/views.gyp:views_test_support',
+                '../ui/ui.gyp:ui_resources',
+              ],
+              'sources/': [
+                ['exclude', 'shell/browser/shell_aura.cc'],
+              ],
+            }, {
+              'sources/': [
+                ['exclude', 'shell/browser/shell_views.cc'],
+              ],
+            }],
+          ],
+        }, {
+          'sources/': [
+            ['exclude', 'shell/browser/shell_aura.cc'],
+            ['exclude', 'shell/browser/shell_views.cc'],
+          ],
         }],  # use_aura==1
         ['chromeos==1', {
           'dependencies': [