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/extensions/electron_extension_system.cc

@@ -87,6 +87,8 @@ void ElectronExtensionSystem::InitForRegularProfile(bool extensions_enabled) {
   management_policy_ = std::make_unique<ManagementPolicy>();
 }
 
+namespace {
+
 std::unique_ptr<base::Value::Dict> ParseManifest(
     const std::string_view manifest_contents) {
   JSONStringValueDeserializer deserializer(manifest_contents);
@@ -100,6 +102,8 @@ std::unique_ptr<base::Value::Dict> ParseManifest(
   return std::make_unique<base::Value::Dict>(std::move(*manifest).TakeDict());
 }
 
+}  // namespace
+
 void ElectronExtensionSystem::LoadComponentExtensions() {
   std::string utf8_error;
 #if BUILDFLAG(ENABLE_PDF_VIEWER)