Update the number of test folders after bug fixed

As the flakiness on the temporary random directories creation was solved
by using base::rand_util on crrev.com/15479003, the number of folders
can be increased back.

BUG=NONE

Review URL: https://codereview.chromium.org/251493003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266088 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/media_galleries/fileapi/picasa_file_util_unittest.cc

@@ -510,9 +510,7 @@ TEST_F(PicasaFileUtilTest, ManyFolders) {
   ScopedVector<TestFolder> test_folders;
   base::Time test_date = base::Time::FromLocalExploded(test_date_exploded);
 
-  // TODO(tommycli): Turn number of test folders back up to 50 (or more) once
-  // https://codereview.chromium.org/15479003/ lands.
-  for (unsigned int i = 0; i < 25; ++i) {
+  for (unsigned int i = 0; i < 50; ++i) {
     base::Time date = test_date - base::TimeDelta::FromDays(i);
 
     test_folders.push_back(