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This CL changes ImageFetcherBridge behaviour for different profiles.
Today, ImageFectherBridge is singleton, so there is only one instance
created for one regular and multiple incognito profiles on Android. To
avoid data leak between profiles, we need to create different instances
for each profile.

By this CL;
- Each call to |ImageFectherBridge#getForProfile| function creates an
instance of ImageFectherBridge that stores profile as member variable.
- Each call to any other function of ImageFectherBridge will directly
hit the native services through native bridge.
- Native image_fetcher_bridge is a wrapper to reach the service that
belongs to the given profile. There is no member functions anymore, but
all are static.

Bug: 1075562, 1041781, 1083923

Change-Id: Ic96d1c8fa1a7bd093abcf8939375f8934fd3cd92
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2231124
Commit-Queue: Side YILMAZ <sideyilmaz@chromium.org>
Reviewed-by: Filip Gorski <fgorski@chromium.org>
Reviewed-by: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779817}