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All the parameters for LoadFromServer() is consolidated in 
struct LoadFeedParams, and the function is made private in
GDataWapiFeedLoader class. Instead, SearchFromServer()
and LoadDirectoryFromServer() public methods are added to the class.
|should_fetch_multiple_feeds| parameter was never used with
false value, so it is removed.



BUG=141359
TEST=all tests pass, manually check file browser works.

Review URL: https://chromiumcodereview.appspot.com/10836285

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@152252 0039d316-1c4b-4281-b951-d872f2087c98