Remove more dead code from core/ folder

Remove more dead code from core/ folder

Remove more dead code from core/ folder. Several functions were defined but
never used.

R=eseidel@chromium.org, adamk@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=171960

[kenneth.r.christiansen, 2014-04-18 17:45:42]

lgtm

[adamk, 2014-04-18 18:01:54]

lgtm

[Inactive, 2014-04-18 18:02:34]

The CQ bit was checked by ch.dumez@samsung.com

[commit-bot: I haz the power, 2014-04-18 18:02:51]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/ch.dumez@samsung.com/241643006/1

[commit-bot: I haz the power, 2014-04-18 18:14:33]

Change committed as 171960

[commit-bot: I haz the power, 2014-04-18 18:14:58]

Failed to apply patch for Source/core/clipboard/DataObject.cpp:
While running patch -p1 --forward --force --no-backup-if-mismatch;
  patching file Source/core/clipboard/DataObject.cpp
  Hunk #1 FAILED at 124.
  1 out of 1 hunk FAILED -- saving rejects to file
Source/core/clipboard/DataObject.cpp.rej

Patch:       Source/core/clipboard/DataObject.cpp
Index: Source/core/clipboard/DataObject.cpp
diff --git a/Source/core/clipboard/DataObject.cpp
b/Source/core/clipboard/DataObject.cpp
index
e904f89d9e290fbae463d49d80b37014efd1c28e..671af3d4e627cfc13ec626139551c90a8b6c8cd8
100644
--- a/Source/core/clipboard/DataObject.cpp
+++ b/Source/core/clipboard/DataObject.cpp
@@ -124,17 +124,6 @@ void DataObject::clearData(const String& type)
     }
 }
 
-void DataObject::clearAllExceptFiles()
-{
-    for (size_t i = 0; i < m_itemList.size(); ) {
-        if (m_itemList[i]->kind() != DataObjectItem::FileKind) {
-            m_itemList.remove(i);
-            continue;
-        }
-        ++i;
-    }
-}
-
 ListHashSet<String> DataObject::types() const
 {
     ListHashSet<String> results;