Revert of [Bindings] Create and use V8 context snapshots

gin/v8_initializer.h

Index: gin/v8_initializer.h
diff --git a/gin/v8_initializer.h b/gin/v8_initializer.h
index 8601b15238e12635365e632d538004d9dc3841a7..7d16c3eb6d940e39d2ba9ad5b1f4ba22eddb753a 100644
--- a/gin/v8_initializer.h
+++ b/gin/v8_initializer.h
@@ -76,20 +76,6 @@
 #endif
 
 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
-
-  // Load V8 context snapshot from user provided platform file descriptors.
-  // Other details are same with LoadV8SnapshotFromFD.
-  static void LoadV8ContextSnapshotFromFD(base::PlatformFile snapshot_fd,
-                                          int64_t snapshot_offset,
-                                          int64_t snapshot_size);
-
-  // Load V8 context snapshot from default resources, if they are available.
-  static void LoadV8ContextSnapshot();
-
-  // Get address and size information for currently loaded V8 context snapshot.
-  // If no snapshot is loaded, the return values are nullptr and 0.
-  static void GetV8ContextSnapshotData(const char** snapshot_data_out,
-                                       int* snapshot_size_out);
 };
 
 }  // namespace gin