Convert device_sensors to use mojo.

content/browser/device_sensors/data_fetcher_shared_memory_base.h

Index: content/browser/device_sensors/data_fetcher_shared_memory_base.h
diff --git a/content/browser/device_sensors/data_fetcher_shared_memory_base.h b/content/browser/device_sensors/data_fetcher_shared_memory_base.h
index f6431f82ffeb4691c1d050ec963e2c0bc1e9ca88..f8326aac03791e2272280f3d97db6e450aa4539f 100644
--- a/content/browser/device_sensors/data_fetcher_shared_memory_base.h
+++ b/content/browser/device_sensors/data_fetcher_shared_memory_base.h
@@ -13,6 +13,7 @@
 #include "base/message_loop/message_loop.h"
 #include "content/browser/device_sensors/device_sensors_consts.h"
 #include "content/common/content_export.h"
+#include "mojo/public/cpp/system/buffer.h"
 
 namespace content {
 
@@ -36,12 +37,11 @@ class CONTENT_EXPORT DataFetcherSharedMemoryBase {
   // sensors are unregistered.
   virtual void Shutdown();
 
-  // Returns the shared memory handle of the device sensor data
-  // duplicated into the given process. This method should only be
-  // called after a call to StartFetchingDeviceData method with
+  // Returns the shared memory handle of the device sensor data. This method
+  // should only be called after a call to StartFetchingDeviceData method with
   // corresponding |consumer_type| parameter.
-  base::SharedMemoryHandle GetSharedMemoryHandleForProcess(
-      ConsumerType consumer_type, base::ProcessHandle process);
+  mojo::ScopedSharedBufferHandle GetSharedMemoryHandle(
+      ConsumerType consumer_type);
 
   enum FetcherType {
     // Fetcher runs on the same thread as its creator.
@@ -84,15 +84,15 @@ class CONTENT_EXPORT DataFetcherSharedMemoryBase {
 
  private:
   bool InitAndStartPollingThreadIfNecessary();
-  base::SharedMemory* GetSharedMemory(ConsumerType consumer_type);
   void* GetSharedMemoryBuffer(ConsumerType consumer_type);
 
   unsigned started_consumers_;
 
   std::unique_ptr<PollingThread> polling_thread_;
 
-  // Owning pointers. Objects in the map are deleted in dtor.
-  typedef std::map<ConsumerType, base::SharedMemory*> SharedMemoryMap;
+  using SharedMemoryMap = std::map<ConsumerType,
+                                   std::pair<mojo::ScopedSharedBufferHandle,
+                                             mojo::ScopedSharedBufferMapping>>;
   SharedMemoryMap shared_memory_map_;
 
   DISALLOW_COPY_AND_ASSIGN(DataFetcherSharedMemoryBase);