Fix import URL eating tons of memory on large file downloads #8621

Job	Run time
build (arm64-android, android_arm64_v8a, OFF, android-arm64)	9m 43s
build (arm64-android, android_arm64_v8a, ON, android-arm64)	8m 27s
build (arm-neon-android, android_armv7, OFF, android-arm-neon)	11m 2s
build (arm-neon-android, android_armv7, ON, android-arm-neon)	8m 18s
build (x64-android, android_x86_64, OFF, android-x64)	10m 6s
build (x64-android, android_x86_64, ON, android-x64)	8m 10s
build (x86-android, android_x86, OFF, android-x86)	11m 15s
build (x86-android, android_x86, ON, android-x86)	8m 44s
comment (pr)	5s
deploy to play store	0s
comment (commit)	0s
	1h 15m 50s

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