Move compositor ctor and dtor to .cc file.

BUG=None
TEST=Linux clang bot goes green
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Review URL: http://codereview.chromium.org/7848023

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@100154 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/ui/gfx/compositor/compositor.cc b/ui/gfx/compositor/compositor.cc
index 24f7a08..eca0c70 100644
--- a/ui/gfx/compositor/compositor.cc
+++ b/ui/gfx/compositor/compositor.cc
@@ -7,6 +7,14 @@
 
 namespace ui {
 
+Compositor::Compositor(CompositorDelegate* delegate, const gfx::Size& size)
+    : delegate_(delegate),
+      size_(size) {
+}
+
+Compositor::~Compositor() {
+}
+
 void Compositor::NotifyStart() {
   OnNotifyStart();
 }