Add BORINGSSL_PREFIX to CronetTests

src/objective-c/tests/Tests.xcodeproj/project.pbxproj

@@ -1326,6 +1326,13 @@
 					"$(PROJECT_DIR)/Pods/CronetFramework",
 				);
 				GCC_C_LANGUAGE_STANDARD = gnu11;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"$(inherited)",
+					"COCOAPODS=1",
+					"$(inherited)",
+					"GPB_USE_PROTOBUF_FRAMEWORK_IMPORTS=1",
+					"BORINGSSL_PREFIX=GRPC",
+				);
 				GCC_WARN_INHIBIT_ALL_WARNINGS = YES;
 				INFOPLIST_FILE = Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";