Move ColorChooser{,Client} and DateTimeChooser{,Client} from platform to core.

Source/core/html/forms/DateTimeChooserClient.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef DateTimeChooserClient_h
 #define DateTimeChooserClient_h
 
-#include "platform/PlatformExport.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
-class PLATFORM_EXPORT DateTimeChooserClient {
+class DateTimeChooserClient {
 public:
     virtual ~DateTimeChooserClient();
 
     // Called when user picked a value.
     virtual void didChooseValue(const String&) = 0;
     // Called when user picked a value.
     virtual void didChooseValue(double) = 0;
     // Called when chooser has ended.
     virtual void didEndChooser() = 0;
 };
 
 } // namespace blink
 #endif // DateTimeChooserClient_h