Fix shadowed variables in the content layer.

Shadowed variables can make code harder to read. Don't support them
in the content layer.

BUG=794619

This CL was uploaded by git cl split.

R=bauerb@chromium.org

Change-Id: I5743df2f237a1dd0f88e880b96abf6a0aea3b1d3
Reviewed-on: https://chromium-review.googlesource.com/924165Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537367}

content/common/plugin_list.cc

@@ -245,8 +245,8 @@ void PluginList::GetPluginInfoArray(
     std::string actual_mime_type;
     for (size_t i = 0; i < plugins_list_.size(); ++i) {
       if (SupportsExtension(plugins_list_[i], extension, &actual_mime_type)) {
-        base::FilePath path = plugins_list_[i].path;
-        if (visited_plugins.insert(path).second) {
+        base::FilePath plugin_path = plugins_list_[i].path;
+        if (visited_plugins.insert(plugin_path).second) {
           info->push_back(plugins_list_[i]);
           if (actual_mime_types)
             actual_mime_types->push_back(actual_mime_type);