bookmarks: Remove unnecessary namespace qualifiers.

It is not necessary to prefix types with bookmarks:: inside bookmarks
namespace.

BUG=None
R=sky@chromium.org

Review URL: https://codereview.chromium.org/955753002

Cr-Commit-Position: refs/heads/master@{#318227}

components/bookmarks/browser/bookmark_utils.cc

@@ -510,13 +510,12 @@ const BookmarkNode* GetBookmarkNodeByID(const BookmarkModel* model, int64 id) {
   return GetNodeByID(model->root_node(), id);
 }
 
-bool IsDescendantOf(const bookmarks::BookmarkNode* node,
-                    const bookmarks::BookmarkNode* root) {
+bool IsDescendantOf(const BookmarkNode* node, const BookmarkNode* root) {
   return node && node->HasAncestor(root);
 }
 
-bool HasDescendantsOf(const std::vector<const bookmarks::BookmarkNode*>& list,
-                      const bookmarks::BookmarkNode* root) {
+bool HasDescendantsOf(const std::vector<const BookmarkNode*>& list,
+                      const BookmarkNode* root) {
   for (const BookmarkNode* node : list) {
     if (IsDescendantOf(node, root))
       return true;

components/bookmarks/browser/bookmark_utils.h

@@ -151,12 +151,11 @@ bool IsBookmarkedByUser(BookmarkModel* model, const GURL& url);
 const BookmarkNode* GetBookmarkNodeByID(const BookmarkModel* model, int64 id);
 
 // Returns true if |node| is a descendant of |root|.
-bool IsDescendantOf(const bookmarks::BookmarkNode* node,
-                    const bookmarks::BookmarkNode* root);
+bool IsDescendantOf(const BookmarkNode* node, const BookmarkNode* root);
 
 // Returns true if any node in |list| is a descendant of |root|.
-bool HasDescendantsOf(const std::vector<const bookmarks::BookmarkNode*>& list,
-                      const bookmarks::BookmarkNode* root);
+bool HasDescendantsOf(const std::vector<const BookmarkNode*>& list,
+                      const BookmarkNode* root);
 
 }  // namespace bookmarks