Clippy: replace "drifty" icon with "page_white_copy" from Silk Icons

The "drifty" icon looks ugly and out of place compared with the Silk
Icons which have recently been introduced.

Replace it with a Silk icon.

Change-Id: Idec6e968e001955b725e19410d8acb02a3c09537

gerrit-gwtexpui/BUCK

@@ -7,7 +7,7 @@ gwt_module(
   resources = [
     SRC + 'clippy/client/clippy.css',
     SRC + 'clippy/client/clippy.swf',
-    SRC + 'clippy/client/clipboard-16.png',
+    SRC + 'clippy/client/page_white_copy.png',
     SRC + 'clippy/client/CopyableLabelText.properties',
   ],
   provided_deps = ['//lib/gwt:user'],
@@ -15,7 +15,7 @@ gwt_module(
     ':SafeHtml',
     ':UserAgent',
     '//lib:LICENSE-clippy',
-    '//lib:LICENSE-drifty',
+    '//lib:LICENSE-silk_icons',
   ],
   visibility = ['PUBLIC'],
 )

gerrit-gwtexpui/src/main/java/com/google/gwtexpui/clippy/client/ClippyResources.java

@@ -30,6 +30,6 @@ public interface ClippyResources extends ClientBundle {
   @DoNotEmbed
   DataResource swf();
 
-  @Source("clipboard-16.png")
+  @Source("page_white_copy.png")
   ImageResource clipboard();
 }

lib/BUCK

@@ -10,7 +10,6 @@ define_license(name = 'CC-BY3.0')
 define_license(name = 'clippy')
 define_license(name = 'codemirror')
 define_license(name = 'diffy')
-define_license(name = 'drifty')
 define_license(name = 'freebie_application_icon_set')
 define_license(name = 'h2')
 define_license(name = 'jgit')

lib/LICENSE-drifty

@@ -1,21 +0,0 @@
-The MIT License (MIT)
-
-Copyright (c) 2014 Drifty (http://drifty.com/)
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.