Rename CollectionIndexCache API to not use 'Element'

Rename CollectionIndexCache API to not use 'Element'

Rename CollectionIndexCache API to not use 'Element':
- traverseToFirstElement() -> traverseToFirst()
- traverseToLastElement() -> traverseToLast()

Using Element is confusing because some CollectionIndexCache users like
ChildNodeList deal with pure Nodes. The Node type is a template parameter
of the CollectionIndexCache class so the API should be seem to be Element
specific.

R=rob.buis@samsung.com

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=180371

[Inactive, 2014-08-13 22:55:55]

Let me know if you have a better naming suggestion.

[rwlbuis, 2014-08-15 15:10:26]

lgtm

[Inactive, 2014-08-15 15:11:53]

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

[commit-bot: I haz the power, 2014-08-15 15:13:39]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ch.dumez@samsung.com/469913002/1

[commit-bot: I haz the power, 2014-08-15 15:14:09]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-08-15 15:14:10]

Failed to apply patch for Source/core/dom/LiveNodeList.cpp:
While running patch -p1 --forward --force --no-backup-if-mismatch;
  patching file Source/core/dom/LiveNodeList.cpp
  Hunk #1 FAILED at 50.
  1 out of 1 hunk FAILED -- saving rejects to file
Source/core/dom/LiveNodeList.cpp.rej

Patch:       Source/core/dom/LiveNodeList.cpp
Index: Source/core/dom/LiveNodeList.cpp
diff --git a/Source/core/dom/LiveNodeList.cpp b/Source/core/dom/LiveNodeList.cpp
index
b437e68908ef5f953b87c4a67035faba2adf0f00..0daab416ba5ef99dfcd309b5af25217ec06f15e9
100644
--- a/Source/core/dom/LiveNodeList.cpp
+++ b/Source/core/dom/LiveNodeList.cpp
@@ -50,12 +50,12 @@ Element* LiveNodeList::item(unsigned offset) const
     return m_collectionIndexCache.nodeAt(*this, offset);
 }
 
-Element* LiveNodeList::traverseToFirstElement() const
+Element* LiveNodeList::traverseToFirst() const
 {
     return firstMatchingElement(*this);
 }
 
-Element* LiveNodeList::traverseToLastElement() const
+Element* LiveNodeList::traverseToLast() const
 {
     return lastMatchingElement(*this);
 }

[Inactive, 2014-08-15 15:17:51]

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

[commit-bot: I haz the power, 2014-08-15 15:18:48]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ch.dumez@samsung.com/469913002/20001

[commit-bot: I haz the power, 2014-08-15 16:17:17]

Committed patchset #2 (20001) as 180371