Enable isolated splits in canary and dev

All major crashes have been fixed and numbers look good. M88 branch was
just cut, so should be safe to enable now.

Bug: 1126301
Change-Id: I351d565e68f14af2411c71fa80f34852bab5455a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2529729Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827387}

chrome/android/modules/buildflags.gni

@@ -13,7 +13,7 @@ declare_args() {
   # other DFMs.
   # TODO(crbug.com/1126301): The binary size tools need to be updated to include
   # DFM code before this can be enabled on stable.
-  enable_chrome_module = false
+  enable_chrome_module = android_channel == "canary" || android_channel == "dev"
 
   # Whether to enable DFMs which depend on the chrome DFM. These will be split
   # out of the chrome DFM using DexSplitter.