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

Source/core/html/forms/ColorChooser.h

Index: Source/core/html/forms/ColorChooser.h
diff --git a/Source/platform/ColorChooser.h b/Source/core/html/forms/ColorChooser.h
similarity index 96%
rename from Source/platform/ColorChooser.h
rename to Source/core/html/forms/ColorChooser.h
index 8d1690d21f045cf2e6e62fa833a51f1593c7807c..8d7dfe3e843e3aeab64965c3c72c4c3ebe48300e 100644
--- a/Source/platform/ColorChooser.h
+++ b/Source/core/html/forms/ColorChooser.h
@@ -30,13 +30,11 @@
 #ifndef ColorChooser_h
 #define ColorChooser_h
 
-#include "platform/PlatformExport.h"
-
 namespace blink {
 
 class Color;
 
-class PLATFORM_EXPORT ColorChooser {
+class ColorChooser {
 public:
     ColorChooser();
     virtual ~ColorChooser();