During image destroy, delete textures only if we have a GL context.

ui/gl/gl_image_surface_texture.cc

Index: ui/gl/gl_image_surface_texture.cc
diff --git a/ui/gl/gl_image_surface_texture.cc b/ui/gl/gl_image_surface_texture.cc
index 8d0a0e7e22b0476da7157aeae8c0a106bbcd1a96..94d39a9e9eb3a05a512b4fcf3dc221e79c0090f9 100644
--- a/ui/gl/gl_image_surface_texture.cc
+++ b/ui/gl/gl_image_surface_texture.cc
@@ -13,7 +13,10 @@ namespace gfx {
 GLImageSurfaceTexture::GLImageSurfaceTexture(gfx::Size size)
     : size_(size), texture_id_(0) {}
 
-GLImageSurfaceTexture::~GLImageSurfaceTexture() { Destroy(); }
+GLImageSurfaceTexture::~GLImageSurfaceTexture() {
+  DCHECK(!surface_texture_);
+  DCHECK_EQ(0u, texture_id_);
+}
 
 bool GLImageSurfaceTexture::Initialize(gfx::GpuMemoryBufferHandle buffer) {
   DCHECK(!surface_texture_);
@@ -24,7 +27,7 @@ bool GLImageSurfaceTexture::Initialize(gfx::GpuMemoryBufferHandle buffer) {
   return !!surface_texture_;
 }
 
-void GLImageSurfaceTexture::Destroy() {
+void GLImageSurfaceTexture::Destroy(bool have_context) {
   surface_texture_ = NULL;
   texture_id_ = 0;
 }