Make "grey" for searchbox text/icons darker.

I'm going a step further from the bug and inferring we want to keep
the colors of the icons in sync with the text.

Bug: 17931509
Change-Id: Ia16b71b9fdad52652f905fcb64c445290e05d675
diff --git a/res-common/values/colors.xml b/res-common/values/colors.xml
index 02ba95d..1da07fb 100644
--- a/res-common/values/colors.xml
+++ b/res-common/values/colors.xml
@@ -139,9 +139,9 @@
     <color name="searchbox_text_color">#000000</color>
     <!-- Background color of the search box -->
     <color name="searchbox_background_color">#ffffff</color>
-    <!-- Text color of the search box hint text  -->
-    <color name="searchbox_hint_text_color">#a4a4a4</color>
-    <color name="searchbox_icon_tint">#a4a4a4</color>
+
+    <color name="searchbox_hint_text_color">#737373</color>
+    <color name="searchbox_icon_tint">@color/searchbox_hint_text_color</color>
 
     <color name="search_shortcut_background_color">#b6b6b6</color>
     <color name="search_shortcut_icon_color">#f8f8f8</color>