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

Source/core/html/forms/DateTimeChooserClient.h

Index: Source/core/html/forms/DateTimeChooserClient.h
diff --git a/Source/platform/DateTimeChooserClient.h b/Source/core/html/forms/DateTimeChooserClient.h
similarity index 96%
rename from Source/platform/DateTimeChooserClient.h
rename to Source/core/html/forms/DateTimeChooserClient.h
index 302ca2f29892e34c6300944218ef3c800a11ce23..5083ab67142e0cde3e1619470a448f538727fec4 100644
--- a/Source/platform/DateTimeChooserClient.h
+++ b/Source/core/html/forms/DateTimeChooserClient.h
@@ -31,12 +31,11 @@
 #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();