Forward-declare BlinkTransferableMessage in headers.

This works around issues with mojom dependencies by removing a path by
which certain tricky source files could end up requiring a mojom
generated dependency. These headers are often included and don't
actually need more than a forward declaration of
BlinkTransferableMessage to build.

Bug: 1059367
Change-Id: Iaee2c3c146f24977f3e0b8db52c2a59425824b40
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2095205
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Commit-Queue: Kevin McNee <mcnee@chromium.org>
Reviewed-by: Kevin McNee <mcnee@chromium.org>
Auto-Submit: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748343}

third_party/blink/renderer/core/html/portal/portal_host.cc

@@ -15,6 +15,7 @@
 #include "third_party/blink/renderer/core/frame/local_frame_client.h"
 #include "third_party/blink/renderer/core/html/portal/dom_window_portal_host.h"
 #include "third_party/blink/renderer/core/html/portal/portal_post_message_helper.h"
+#include "third_party/blink/renderer/core/messaging/blink_transferable_message.h"
 #include "third_party/blink/renderer/core/page/page.h"
 #include "third_party/blink/renderer/platform/wtf/text/atomic_string.h"
 

third_party/blink/renderer/core/html/portal/portal_host.h

@@ -9,11 +9,11 @@
 #include "third_party/blink/public/mojom/portal/portal.mojom-blink.h"
 #include "third_party/blink/renderer/core/core_export.h"
 #include "third_party/blink/renderer/core/dom/events/event_target.h"
-#include "third_party/blink/renderer/core/messaging/blink_transferable_message.h"
 #include "third_party/blink/renderer/platform/supplementable.h"
 
 namespace blink {
 
+struct BlinkTransferableMessage;
 class Document;
 class ExecutionContext;
 class LocalDOMWindow;

third_party/blink/renderer/core/workers/dedicated_worker_global_scope.cc

@@ -42,6 +42,7 @@
 #include "third_party/blink/renderer/core/execution_context/execution_context.h"
 #include "third_party/blink/renderer/core/frame/csp/content_security_policy.h"
 #include "third_party/blink/renderer/core/inspector/worker_thread_debugger.h"
+#include "third_party/blink/renderer/core/messaging/blink_transferable_message.h"
 #include "third_party/blink/renderer/core/origin_trials/origin_trial_context.h"
 #include "third_party/blink/renderer/core/probe/core_probes.h"
 #include "third_party/blink/renderer/core/workers/dedicated_worker_object_proxy.h"

third_party/blink/renderer/core/workers/dedicated_worker_object_proxy.cc

@@ -43,6 +43,7 @@
 #include "third_party/blink/renderer/core/execution_context/execution_context.h"
 #include "third_party/blink/renderer/core/frame/user_activation.h"
 #include "third_party/blink/renderer/core/inspector/console_message.h"
+#include "third_party/blink/renderer/core/messaging/blink_transferable_message.h"
 #include "third_party/blink/renderer/core/workers/dedicated_worker_messaging_proxy.h"
 #include "third_party/blink/renderer/core/workers/parent_execution_context_task_runners.h"
 #include "third_party/blink/renderer/core/workers/worker_global_scope.h"

third_party/blink/renderer/core/workers/dedicated_worker_object_proxy.h

@@ -35,7 +35,6 @@
 #include "base/macros.h"
 #include "base/memory/scoped_refptr.h"
 #include "third_party/blink/renderer/core/core_export.h"
-#include "third_party/blink/renderer/core/messaging/blink_transferable_message.h"
 #include "third_party/blink/renderer/core/messaging/message_port.h"
 #include "third_party/blink/renderer/core/workers/threaded_object_proxy_base.h"
 #include "third_party/blink/renderer/core/workers/worker_reporting_proxy.h"
@@ -43,6 +42,7 @@
 
 namespace blink {
 
+struct BlinkTransferableMessage;
 class DedicatedWorkerMessagingProxy;
 class ParentExecutionContextTaskRunners;
 class ThreadedMessagingProxyBase;

third_party/blink/renderer/core/workers/worker_global_scope.cc

@@ -48,6 +48,7 @@
 #include "third_party/blink/renderer/core/inspector/worker_inspector_controller.h"
 #include "third_party/blink/renderer/core/inspector/worker_thread_debugger.h"
 #include "third_party/blink/renderer/core/loader/threadable_loader.h"
+#include "third_party/blink/renderer/core/messaging/blink_transferable_message.h"
 #include "third_party/blink/renderer/core/messaging/message_port.h"
 #include "third_party/blink/renderer/core/probe/core_probes.h"
 #include "third_party/blink/renderer/core/script/classic_script.h"

third_party/blink/renderer/core/workers/worker_global_scope.h

@@ -37,7 +37,6 @@
 #include "third_party/blink/renderer/core/dom/frame_request_callback_collection.h"
 #include "third_party/blink/renderer/core/execution_context/execution_context.h"
 #include "third_party/blink/renderer/core/frame/csp/content_security_policy.h"
-#include "third_party/blink/renderer/core/messaging/blink_transferable_message.h"
 #include "third_party/blink/renderer/core/script/script.h"
 #include "third_party/blink/renderer/core/workers/global_scope_creation_params.h"
 #include "third_party/blink/renderer/core/workers/worker_or_worklet_global_scope.h"
@@ -48,6 +47,7 @@
 
 namespace blink {
 
+struct BlinkTransferableMessage;
 class ConsoleMessage;
 class ExceptionState;
 class FetchClientSettingsObjectSnapshot;