ui: Have shell_dialogs into its own gyp file under its shell_dialogs/ directory.

build/all.gyp

Index: build/all.gyp
diff --git a/build/all.gyp b/build/all.gyp
index 0237e1c5e0956084c8a090f5ae72df37484c9b71..85d7ec0b380dde201b71b8d9a77bdeb888981801 100644
--- a/build/all.gyp
+++ b/build/all.gyp
@@ -220,7 +220,7 @@
         '../crypto/crypto.gyp:crypto_unittests',
         '../net/net.gyp:net_unittests',
         '../sql/sql.gyp:sql_unittests',
-        '../ui/ui.gyp:ui_unittests',
+        '../ui/ui_unittests.gyp:ui_unittests',
         '../url/url.gyp:url_unittests',
       ],
       'conditions': [
@@ -604,7 +604,7 @@
             '../third_party/cacheinvalidation/cacheinvalidation.gyp:cacheinvalidation_unittests',
             '../third_party/libphonenumber/libphonenumber.gyp:libphonenumber_unittests',
             '../tools/perf/clear_system_cache/clear_system_cache.gyp:*',
-            '../ui/ui.gyp:ui_unittests',
+            '../ui/ui_unittests.gyp:ui_unittests',
             '../url/url.gyp:url_unittests',
             '../webkit/renderer/compositor_bindings/compositor_bindings_tests.gyp:webkit_compositor_bindings_unittests',
           ],
@@ -637,7 +637,7 @@
             '../third_party/cacheinvalidation/cacheinvalidation.gyp:cacheinvalidation_unittests',
             '../third_party/libphonenumber/libphonenumber.gyp:libphonenumber_unittests',
             '../tools/perf/clear_system_cache/clear_system_cache.gyp:*',
-            '../ui/ui.gyp:ui_unittests',
+            '../ui/ui_unittests.gyp:ui_unittests',
             '../url/url.gyp:url_unittests',
             '../webkit/renderer/compositor_bindings/compositor_bindings_tests.gyp:webkit_compositor_bindings_unittests',
           ],
@@ -690,7 +690,7 @@
             '../sync/sync.gyp:sync_unit_tests',
             '../third_party/cacheinvalidation/cacheinvalidation.gyp:cacheinvalidation_unittests',
             '../third_party/libphonenumber/libphonenumber.gyp:libphonenumber_unittests',
-            '../ui/ui.gyp:ui_unittests',
+            '../ui/ui_unittests.gyp:ui_unittests',
             '../url/url.gyp:url_unittests',
           ],
         },
@@ -737,7 +737,7 @@
             '../third_party/cacheinvalidation/cacheinvalidation.gyp:cacheinvalidation_unittests',
             '../third_party/libphonenumber/libphonenumber.gyp:libphonenumber_unittests',
             '../tools/perf/clear_system_cache/clear_system_cache.gyp:*',
-            '../ui/ui.gyp:ui_unittests',
+            '../ui/ui_unittests.gyp:ui_unittests',
             '../ui/views/views.gyp:views_unittests',
             '../url/url.gyp:url_unittests',
             '../webkit/renderer/compositor_bindings/compositor_bindings_tests.gyp:webkit_compositor_bindings_unittests',
@@ -902,7 +902,7 @@
             '../ui/aura/aura.gyp:*',
             '../ui/compositor/compositor.gyp:*',
             '../ui/message_center/message_center.gyp:*',
-            '../ui/ui.gyp:ui_unittests',
+            '../ui/ui_unittests.gyp:ui_unittests',
             '../ui/snapshot/snapshot.gyp:snapshot_unittests',
             '../ui/views/views.gyp:views',
             '../ui/views/views.gyp:views_examples_with_content_exe',