Fix the indirect pure virtual calls in DataFetcherSharedMemoryBase destructor.

content/browser/device_sensors/data_fetcher_shared_memory_base.cc

Index: content/browser/device_sensors/data_fetcher_shared_memory_base.cc
diff --git a/content/browser/device_sensors/data_fetcher_shared_memory_base.cc b/content/browser/device_sensors/data_fetcher_shared_memory_base.cc
index 6a9b7d287d30eb19c5a26c59dff0b80b873ddfbe..4248fe5a9f300429899a4bc04a046c2c1f29591b 100644
--- a/content/browser/device_sensors/data_fetcher_shared_memory_base.cc
+++ b/content/browser/device_sensors/data_fetcher_shared_memory_base.cc
@@ -104,8 +104,7 @@ DataFetcherSharedMemoryBase::DataFetcherSharedMemoryBase()
 }
 
 DataFetcherSharedMemoryBase::~DataFetcherSharedMemoryBase() {
-  StopFetchingDeviceData(CONSUMER_TYPE_MOTION);
-  StopFetchingDeviceData(CONSUMER_TYPE_ORIENTATION);
+  DCHECK_EQ(0u, started_consumers_);
 
   // make sure polling thread stops asap.
   if (polling_thread_)
@@ -163,6 +162,11 @@ bool DataFetcherSharedMemoryBase::StopFetchingDeviceData(
   return true;
 }
 
+void DataFetcherSharedMemoryBase::StopFetchingAllDeviceData() {
+  StopFetchingDeviceData(CONSUMER_TYPE_MOTION);
+  StopFetchingDeviceData(CONSUMER_TYPE_ORIENTATION);
+}
+
 base::SharedMemoryHandle
 DataFetcherSharedMemoryBase::GetSharedMemoryHandleForProcess(
     ConsumerType consumer_type, base::ProcessHandle process) {
@@ -240,5 +244,4 @@ bool DataFetcherSharedMemoryBase::IsPollingTimerRunningForTesting() const {
   return polling_thread_ ? polling_thread_->IsTimerRunning() : false;
 }
 
-
 }  // namespace content