Move PageTransition into content namespace. While I'm touching all these files, I've also updated...

chrome/browser/ui/cocoa/tab_contents/web_drop_target.mm

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/tab_contents/web_drop_target.h"
 
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/bookmarks/bookmark_node_data.h"
 #include "chrome/browser/bookmarks/bookmark_pasteboard_helper_mac.h"
 #include "chrome/browser/ui/bookmarks/bookmark_tab_helper.h"
@@ skipping 152 matching lines @@
   if (currentRVH_ != tabContents_->render_view_host())
     [self draggingEntered:info view:view];
 
   // Check if we only allow navigation and navigate to a url on the pasteboard.
   if ([self onlyAllowsNavigation]) {
     NSPasteboard* pboard = [info draggingPasteboard];
     if ([pboard containsURLData]) {
       GURL url;
       drag_util::PopulateURLAndTitleFromPasteBoard(&url, NULL, pboard, YES);
       tabContents_->OpenURL(url, GURL(), CURRENT_TAB,
-                            PageTransition::AUTO_BOOKMARK);
+                            content::PAGE_TRANSITION_AUTO_BOOKMARK);
       return YES;
     }
     return NO;
   }
 
   // If the tab is showing the bookmark manager, send BookmarkDrag events
   BookmarkTabHelper::BookmarkDrag* dragDelegate =
       tab_ ? tab_->bookmark_tab_helper()->GetBookmarkDragDelegate() : NULL;
   BookmarkNodeData dragData;
   if(dragDelegate && dragData.ReadFromDragClipboard())
@@ skipping 61 matching lines @@
         if (exists && !isDir)
           data->filenames.push_back(base::SysNSStringToUTF16(filename));
       }
     }
   }
 
   // TODO(pinkerton): Get file contents. http://crbug.com/34661
 }
 
 @end