Revert of Android: Free GLHelper context ashmem when it makes sense

content/common/gpu/client/context_provider_command_buffer.cc

Index: content/common/gpu/client/context_provider_command_buffer.cc
diff --git a/content/common/gpu/client/context_provider_command_buffer.cc b/content/common/gpu/client/context_provider_command_buffer.cc
index 4308280e3151190f271685bba9b3893d7945d94d..0a6770415584f897786603e69dc4788471fb0738 100644
--- a/content/common/gpu/client/context_provider_command_buffer.cc
+++ b/content/common/gpu/client/context_provider_command_buffer.cc
@@ -119,11 +119,6 @@
   return GL_RGB;
 }
 
-void ContextProviderCommandBuffer::FreeUnusedSharedMemory() {
-  if (bind_succeeded_)
-    gles2_impl_->FreeUnusedSharedMemory();
-}
-
 bool ContextProviderCommandBuffer::BindToCurrentThread() {
   // This is called on the thread the context will be used.
   DCHECK(context_thread_checker_.CalledOnValidThread());