fix: misc-use-internal-linkage warnings (#44843)

* refactor: misc-use-internal-linkage warnings in context bridge

move impl functions into anonymous namespace so that they're not visible
to other compilation units:

- ExposeAPIInWorld()
- IsCalledFromMainWorld()
- OverrideGlobalPropertyFromIsolatedWorld()
- OverrideGlobalValueFromIsolatedWorld()
- TraceKeyPath()

* refactor: misc-use-internal-linkage warnings in skia util

move impl details into anonymous namespace so that they're not visible
to other compilation units:

- struct ScaleFactorPair
- kScaleFactorPairs[]
- GetScaleFactorFromPath()
- AddImageSkiaRepFromPath()

* refactor: misc-use-internal-linkage warnings in printing util

move impl details into anonymous namespace so that they're not visible
to other compilation units:

- GetFullPagePlugin()

* refactor: misc-use-internal-linkage warnings in blijnk converter

move impl details into anonymous namespace so that they're not visible
to other compilation units:

- GetKeyLocationCode()
- ModifiersToArray()

* refactor: misc-use-internal-linkage warnings in extrension system

move impl details into anonymous namespace so that they're not visible
to other compilation units:

- ParseManifest()

* refactor: misc-use-internal-linkage warnings in skia util

move impl details into anonymous namespace so that they're not visible
to other compilation units:

- GetFrameTokenMap()
- GetFrameTreeNodeIdMap()

* refactor: misc-use-internal-linkage warnings in electron_api_utility_process.cc

move impl details into anonymous namespace so that they're not visible
to other compilation units:

- GetAllUtilityProcessWrappers()

* refactor: misc-use-internal-linkage warnings in electron_api_menu

move impl details into anonymous namespace so that they're not visible
to other compilation units:

- InvokeBoolMethod()

* refactor: misc-use-internal-linkage warnings in platform util

move impl details into anonymous namespace so that they're not visible
to other compilation units:

- struct TrashItemResult
- TrashItemOnBlockingThread()

shell/browser/api/electron_api_menu.cc

@@ -70,6 +70,8 @@ Menu::~Menu() {
   }
 }
 
+namespace {
+
 bool InvokeBoolMethod(const Menu* menu,
                       const char* method,
                       int command_id,
@@ -84,6 +86,8 @@ bool InvokeBoolMethod(const Menu* menu,
   return gin::ConvertFromV8(isolate, val, &ret) ? ret : default_value;
 }
 
+}  // namespace
+
 bool Menu::IsCommandIdChecked(int command_id) const {
   return InvokeBoolMethod(this, "_isCommandIdChecked", command_id);
 }

shell/browser/api/electron_api_utility_process.cc

@@ -44,6 +44,8 @@
 
 namespace electron {
 
+namespace {
+
 base::IDMap<api::UtilityProcessWrapper*, base::ProcessId>&
 GetAllUtilityProcessWrappers() {
   static base::NoDestructor<
@@ -52,6 +54,8 @@ GetAllUtilityProcessWrappers() {
   return *s_all_utility_process_wrappers;
 }
 
+}  // namespace
+
 namespace api {
 
 gin::WrapperInfo UtilityProcessWrapper::kWrapperInfo = {

shell/browser/api/electron_api_web_frame_main.cc

@@ -100,6 +100,8 @@ using FrameTreeNodeIdMap = std::unordered_map<content::FrameTreeNodeId,
 using FrameTokenMap =
     std::map<content::GlobalRenderFrameHostToken, WebFrameMain*>;
 
+namespace {
+
 FrameTreeNodeIdMap& GetFrameTreeNodeIdMap() {
   static base::NoDestructor<FrameTreeNodeIdMap> instance;
   return *instance;
@@ -109,6 +111,8 @@ FrameTokenMap& GetFrameTokenMap() {
   return *instance;
 }
 
+}  // namespace
+
 // static
 WebFrameMain* WebFrameMain::FromFrameTreeNodeId(
     content::FrameTreeNodeId frame_tree_node_id) {