Define cc::RendererCapabilities in its own header, fix up includes

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
index 2ac7ebe5b413b97a3b82e1f3cffb58d0e5a213ce..8a3e644bb1109fe7348501cde4fee91fd810f34e 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -51,23 +51,6 @@ static base::StaticAtomicSequenceNumber s_layer_tree_host_sequence_number;
 
 namespace cc {
 
-RendererCapabilities::RendererCapabilities(ResourceFormat best_texture_format,
-                                           bool allow_partial_texture_updates,
-                                           int max_texture_size,
-                                           bool using_shared_memory_resources)
-    : best_texture_format(best_texture_format),
-      allow_partial_texture_updates(allow_partial_texture_updates),
-      max_texture_size(max_texture_size),
-      using_shared_memory_resources(using_shared_memory_resources) {}
-
-RendererCapabilities::RendererCapabilities()
-    : best_texture_format(RGBA_8888),
-      allow_partial_texture_updates(false),
-      max_texture_size(0),
-      using_shared_memory_resources(false) {}
-
-RendererCapabilities::~RendererCapabilities() {}
-
 scoped_ptr<LayerTreeHost> LayerTreeHost::CreateThreaded(
     LayerTreeHostClient* client,
     SharedBitmapManager* shared_bitmap_manager,