Remove build failure with USE_BAZEL_ANALYSIS usage

This verification was present to ensure that users previously using
USE_BAZEL_ANALYSIS=1 realized the change in usage. But this is now dead
code; USE_BAZEL_ANALYSIS=1 will be a complete no-op after this CL.

Test: USE_BAZEL_ANALYSIS=1 m nothing  (and verified this behaves as m
nothing)

Change-Id: I08f75a562c2fb3ce262646fb187f19f3d5857e40
diff --git a/ui/build/build.go b/ui/build/build.go
index ff2d5f2..387962b 100644
--- a/ui/build/build.go
+++ b/ui/build/build.go
@@ -112,10 +112,6 @@
 // checkBazelMode fails the build if there are conflicting arguments for which bazel
 // build mode to use.
 func checkBazelMode(ctx Context, config Config) {
-	if config.Environment().IsEnvTrue("USE_BAZEL_ANALYSIS") {
-		ctx.Fatalln("USE_BAZEL_ANALYSIS is deprecated. Unset USE_BAZEL_ANALYSIS.\n" +
-			"Use --bazel-mode-dev instead. For example: `m --bazel-mode-dev nothing`")
-	}
 	if config.bazelProdMode && config.bazelDevMode {
 		ctx.Fatalln("Conflicting bazel mode.\n" +
 			"Do not specify both --bazel-mode and --bazel-mode-dev")