Remove AdoptPrerenderDataFrom.

Dead code. It became unused in https://codereview.chromium.org/146983002.

BUG=none

Review URL: https://codereview.chromium.org/165223005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251267 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/prerender/prerender_handle.cc

@@ -77,27 +77,6 @@ PrerenderHandle::PrerenderHandle(
   }
 }
 
-void PrerenderHandle::AdoptPrerenderDataFrom(PrerenderHandle* other_handle) {
-  DCHECK_EQ(static_cast<PrerenderManager::PrerenderData*>(NULL),
-            prerender_data_.get());
-  if (other_handle->prerender_data_.get() &&
-      other_handle->prerender_data_->contents()) {
-    other_handle->prerender_data_->contents()->RemoveObserver(other_handle);
-  }
-
-  prerender_data_ = other_handle->prerender_data_;
-  other_handle->prerender_data_.reset();
-
-  if (prerender_data_.get()) {
-    DCHECK_NE(static_cast<PrerenderContents*>(NULL),
-              prerender_data_->contents());
-    prerender_data_->contents()->AddObserver(this);
-    // We are joining a prerender that has already started so we fire off an
-    // extra start event at ourselves.
-    OnPrerenderStart(prerender_data_->contents());
-  }
-}
-
 void PrerenderHandle::OnPrerenderStart(PrerenderContents* prerender_contents) {
   DCHECK(CalledOnValidThread());
   DCHECK(prerender_data_.get());

chrome/browser/prerender/prerender_handle.h

@@ -99,8 +99,6 @@ class PrerenderHandle : public base::NonThreadSafe,
 
   explicit PrerenderHandle(PrerenderManager::PrerenderData* prerender_data);
 
-  void AdoptPrerenderDataFrom(PrerenderHandle* other_handle);
-
   // From PrerenderContents::Observer:
   virtual void OnPrerenderStart(PrerenderContents* prerender_contents) OVERRIDE;
   virtual void OnPrerenderStopLoading(PrerenderContents* prerender_contents)

chrome/browser/prerender/prerender_link_manager.cc

@@ -476,9 +476,7 @@ void PrerenderLinkManager::Shutdown() {
   has_shutdown_ = true;
 }
 
-// In practice, this is always called from either
-// PrerenderLinkManager::OnAddPrerender in the regular case, or in the pending
-// prerender case, from PrerenderHandle::AdoptPrerenderDataFrom.
+// In practice, this is always called from PrerenderLinkManager::OnAddPrerender.
 void PrerenderLinkManager::OnPrerenderStart(
     PrerenderHandle* prerender_handle) {
   LinkPrerender* prerender = FindByPrerenderHandle(prerender_handle);