[Files App] Only use the first matching file handler from each app.

chrome/browser/chromeos/file_manager/file_tasks.cc

Index: chrome/browser/chromeos/file_manager/file_tasks.cc
diff --git a/chrome/browser/chromeos/file_manager/file_tasks.cc b/chrome/browser/chromeos/file_manager/file_tasks.cc
index 53cf74bc65ed325772230ab8ef6f1efe10e2c0c9..7965eea0b3908b701c3dd9bee63b8be1f2905ea6 100644
--- a/chrome/browser/chromeos/file_manager/file_tasks.cc
+++ b/chrome/browser/chromeos/file_manager/file_tasks.cc
@@ -413,25 +413,25 @@ void FindFileHandlerTasks(
     if (file_handlers.empty())
       continue;
 
-    for (FileHandlerList::iterator i = file_handlers.begin();
-         i != file_handlers.end(); ++i) {
-      std::string task_id = file_tasks::MakeTaskID(
-          extension->id(), file_tasks::TASK_TYPE_FILE_HANDLER, (*i)->id);
-
-      GURL best_icon = extensions::ExtensionIconSource::GetIconURL(
-          extension,
-          drive::util::kPreferredIconSize,
-          ExtensionIconSet::MATCH_BIGGER,
-          false,  // grayscale
-          NULL);  // exists
-
-      result_list->push_back(FullTaskDescriptor(
-          TaskDescriptor(
-              extension->id(), file_tasks::TASK_TYPE_FILE_HANDLER, (*i)->id),
-          extension->name(),
-          best_icon,
-          false /* is_default */));
-    }
+    // Only show the first matching handler from each app.
+    const extensions::FileHandlerInfo* file_handler = file_handlers.front();
+    std::string task_id = file_tasks::MakeTaskID(
+        extension->id(), file_tasks::TASK_TYPE_FILE_HANDLER, file_handler->id);
+
+    GURL best_icon = extensions::ExtensionIconSource::GetIconURL(
+        extension,
+        drive::util::kPreferredIconSize,
+        ExtensionIconSet::MATCH_BIGGER,
+        false,  // grayscale
+        NULL);  // exists
+
+    result_list->push_back(
+        FullTaskDescriptor(TaskDescriptor(extension->id(),
+                                          file_tasks::TASK_TYPE_FILE_HANDLER,
+                                          file_handler->id),
+                           extension->name(),
+                           best_icon,
+                           false /* is_default */));
   }
 }