Reduce the number of search results for Drive.

Now it requests ridiculously excessive number of results. Tune it down to
just excessive.

BUG=chromium:902600

Change-Id: I300c345284d06a15f3375286ae32cd1de1e30645
Reviewed-on: https://chromium-review.googlesource.com/c/1322329Reviewed-by: Sam McNally <sammc@chromium.org>
Commit-Queue: Sergei Datsenko <dats@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605987}

ui/file_manager/file_manager/foreground/js/directory_contents.js

@@ -233,8 +233,7 @@ Object.freeze(DriveMetadataSearchContentScanner.SearchType);
 DriveMetadataSearchContentScanner.prototype.scan = function(
     entriesCallback, successCallback, errorCallback) {
   chrome.fileManagerPrivate.searchDriveMetadata(
-      {query: '', types: this.searchType_, maxResults: 500},
-      function(results) {
+      {query: '', types: this.searchType_, maxResults: 100}, function(results) {
         if (this.cancelled_) {
           errorCallback(util.createDOMError(util.FileError.ABORT_ERR));
           return;