cc: Give ownership of render passes to the renderer when drawing a frame.

cc/gl_renderer_unittest.cc

Index: cc/gl_renderer_unittest.cc
diff --git a/cc/gl_renderer_unittest.cc b/cc/gl_renderer_unittest.cc
index a8da1435e7524403adf9de36d75c783b91007446..919c4d5635115b04d21c92f4f1e87cce2804c7ce 100644
--- a/cc/gl_renderer_unittest.cc
+++ b/cc/gl_renderer_unittest.cc
@@ -80,8 +80,8 @@ public:
     void setLastCallWasSetVisibilityPointer(bool* lastCallWasSetVisibility) { m_lastCallWasSetVisibility = lastCallWasSetVisibility; }
 
     RenderPass* rootRenderPass() { return m_renderPassesInDrawOrder.back(); }
-    const RenderPassList& renderPassesInDrawOrder() const { return m_renderPassesInDrawOrder; }
-    const RenderPassIdHashMap& renderPasses() const { return m_renderPasses; }
+    RenderPassList& renderPassesInDrawOrder() { return m_renderPassesInDrawOrder; }
+    RenderPassIdHashMap& renderPasses() { return m_renderPasses; }
 
     size_t memoryAllocationLimitBytes() const { return m_memoryAllocationLimitBytes; }