cc: Move GpuMemoryBufferManager interface to gpu namespace.

cc/BUILD.gn

Index: cc/BUILD.gn
diff --git a/cc/BUILD.gn b/cc/BUILD.gn
index 74a3c4b40d684cbe421d6a5f3684b2f59f6a1588..84b7675503e7446be8621cba585a8a37a1ff0dfe 100644
--- a/cc/BUILD.gn
+++ b/cc/BUILD.gn
@@ -327,7 +327,6 @@ component("cc") {
     "resources/content_layer_updater.h",
     "resources/eviction_tile_priority_queue.cc",
     "resources/eviction_tile_priority_queue.h",
-    "resources/gpu_memory_buffer_manager.h",
     "resources/gpu_raster_worker_pool.cc",
     "resources/gpu_raster_worker_pool.h",
     "resources/image_layer_updater.cc",
@@ -488,6 +487,7 @@ component("cc") {
     "//base/third_party/dynamic_annotations",
     "//gpu",
     "//gpu/command_buffer/client:gles2_interface",
+    "//gpu/command_buffer/client:gpu_memory_buffer_manager",
     "//media",
     "//ui/events:events_base",
     "//ui/gfx",
@@ -638,6 +638,7 @@ source_set("test_support") {
     "//base/third_party/dynamic_annotations",
     "//gpu/command_buffer/client:gles2_c_lib",
     "//gpu/command_buffer/client:gles2_implementation",
+    "//gpu/command_buffer/client:gpu_memory_buffer_manager",
     "//gpu/command_buffer/client:gl_in_process_context",
     "//gpu/command_buffer/common:gles2_utils",
     "//gpu/skia_bindings",