Revert of Get rid of gpu related switches by passing gpu::GpuPreferences via IPC.

content/common/gpu/gpu_host_messages.h

Index: content/common/gpu/gpu_host_messages.h
diff --git a/content/common/gpu/gpu_host_messages.h b/content/common/gpu/gpu_host_messages.h
index 7ba30f4362903bc381a8d4c07d6324c209a9a404..1428c8a5bd0d8270598f3dac32d2b2ef86d0b2f7 100644
--- a/content/common/gpu/gpu_host_messages.h
+++ b/content/common/gpu/gpu_host_messages.h
@@ -14,7 +14,6 @@
 #include "content/public/common/common_param_traits.h"
 #include "gpu/command_buffer/common/sync_token.h"
 #include "gpu/command_buffer/common/value_state.h"
-#include "gpu/command_buffer/service/gpu_preferences.h"
 #include "gpu/config/gpu_info.h"
 #include "gpu/ipc/common/memory_stats.h"
 #include "ipc/ipc_channel_handle.h"
@@ -101,33 +100,6 @@
 IPC_STRUCT_TRAITS_END()
 #endif
 
-IPC_STRUCT_TRAITS_BEGIN(gpu::GpuPreferences)
-  IPC_STRUCT_TRAITS_MEMBER(single_process)
-  IPC_STRUCT_TRAITS_MEMBER(in_process_gpu)
-  IPC_STRUCT_TRAITS_MEMBER(ui_prioritize_in_gpu_process)
-  IPC_STRUCT_TRAITS_MEMBER(compile_shader_always_succeeds)
-  IPC_STRUCT_TRAITS_MEMBER(disable_gl_error_limit)
-  IPC_STRUCT_TRAITS_MEMBER(disable_glsl_translator)
-  IPC_STRUCT_TRAITS_MEMBER(disable_gpu_driver_bug_workarounds)
-  IPC_STRUCT_TRAITS_MEMBER(disable_shader_name_hashing)
-  IPC_STRUCT_TRAITS_MEMBER(enable_gpu_command_logging)
-  IPC_STRUCT_TRAITS_MEMBER(enable_gpu_debugging)
-  IPC_STRUCT_TRAITS_MEMBER(enable_gpu_service_logging_gpu)
-  IPC_STRUCT_TRAITS_MEMBER(disable_gpu_program_cache)
-  IPC_STRUCT_TRAITS_MEMBER(enforce_gl_minimums)
-  IPC_STRUCT_TRAITS_MEMBER(force_gpu_mem_available)
-  IPC_STRUCT_TRAITS_MEMBER(gpu_program_cache_size)
-  IPC_STRUCT_TRAITS_MEMBER(disable_gpu_shader_disk_cache)
-  IPC_STRUCT_TRAITS_MEMBER(enable_share_group_async_texture_upload)
-  IPC_STRUCT_TRAITS_MEMBER(enable_subscribe_uniform_extension)
-  IPC_STRUCT_TRAITS_MEMBER(enable_threaded_texture_mailboxes)
-  IPC_STRUCT_TRAITS_MEMBER(gl_shader_interm_output)
-  IPC_STRUCT_TRAITS_MEMBER(emulate_shader_precision)
-  IPC_STRUCT_TRAITS_MEMBER(enable_gpu_service_logging)
-  IPC_STRUCT_TRAITS_MEMBER(enable_gpu_service_tracing)
-  IPC_STRUCT_TRAITS_MEMBER(enable_unsafe_es3_apis)
-IPC_STRUCT_TRAITS_END()
-
 //------------------------------------------------------------------------------
 // GPU Messages
 // These are messages from the browser to the GPU process.
@@ -137,8 +109,7 @@
 // up between the browser and GPU process before doing any work that might
 // potentially crash the GPU process. Detection of the child process
 // exiting abruptly is predicated on having the IPC channel set up.
-IPC_MESSAGE_CONTROL1(GpuMsg_Initialize,
-                     gpu::GpuPreferences /* gpu_prefernces */)
+IPC_MESSAGE_CONTROL0(GpuMsg_Initialize)
 
 // Tells the GPU process to shutdown itself.
 IPC_MESSAGE_CONTROL0(GpuMsg_Finalize)