Remove namespace alias (chrome/browser/extensions)

When using Jumbo build, the namespace alias Create in
/api/context_menus/context_menus_api.cc conflicts
with the function Create called from
api/desktop_capture/desktop_capture_base.cc.
This commits solves the issue by removing the namespace
alias. It also removes the namespace aliases
Update and Remove in the same file to avoid
this issue in the future.

Bug: 850484
Change-Id: Ibdb940e153a89b7120c670e806be34fc4e95ab90
Reviewed-on: https://chromium-review.googlesource.com/1099062Reviewed-by: Ken Rockot <rockot@chromium.org>
Commit-Queue: Oscar Johansson <oscarj@opera.com>
Cr-Commit-Position: refs/heads/master@{#567164}

chrome/browser/extensions/api/context_menus/context_menus_api.cc

@@ -27,14 +27,11 @@ const char kIdRequiredError[] = "Extensions using event pages must pass an "
 
 namespace extensions {
 
-namespace Create = api::context_menus::Create;
-namespace Remove = api::context_menus::Remove;
-namespace Update = api::context_menus::Update;
-
 ExtensionFunction::ResponseAction ContextMenusCreateFunction::Run() {
   MenuItem::Id id(browser_context()->IsOffTheRecord(),
                   MenuItem::ExtensionKey(extension_id()));
-  std::unique_ptr<Create::Params> params(Create::Params::Create(*args_));
+  std::unique_ptr<api::context_menus::Create::Params> params(
+      api::context_menus::Create::Params::Create(*args_));
   EXTENSION_FUNCTION_VALIDATE(params.get());
 
   if (params->create_properties.id.get()) {
@@ -62,7 +59,8 @@ ExtensionFunction::ResponseAction ContextMenusCreateFunction::Run() {
 ExtensionFunction::ResponseAction ContextMenusUpdateFunction::Run() {
   MenuItem::Id item_id(browser_context()->IsOffTheRecord(),
                        MenuItem::ExtensionKey(extension_id()));
-  std::unique_ptr<Update::Params> params(Update::Params::Create(*args_));
+  std::unique_ptr<api::context_menus::Update::Params> params(
+      api::context_menus::Update::Params::Create(*args_));
 
   EXTENSION_FUNCTION_VALIDATE(params.get());
   if (params->id.as_string)
@@ -82,7 +80,8 @@ ExtensionFunction::ResponseAction ContextMenusUpdateFunction::Run() {
 }
 
 ExtensionFunction::ResponseAction ContextMenusRemoveFunction::Run() {
-  std::unique_ptr<Remove::Params> params(Remove::Params::Create(*args_));
+  std::unique_ptr<api::context_menus::Remove::Params> params(
+      api::context_menus::Remove::Params::Create(*args_));
   EXTENSION_FUNCTION_VALIDATE(params.get());
 
   MenuManager* manager = MenuManager::Get(browser_context());