Delete ApiBp2build soong_build mode

This feature is obsolete.

This makes a large number of codepaths "dead code" (such as
module-specific implementations of ApiBp2build functionality). These
will be deleted in a followup CL.

Bug: 284029211
Test: Presubmits
Change-Id: Ib53b99f1fe8c24380d219caf44e9bb3b96724fa0
diff --git a/ui/build/config.go b/ui/build/config.go
index 5d1505a..084d28d 100644
--- a/ui/build/config.go
+++ b/ui/build/config.go
@@ -70,7 +70,6 @@
 	checkbuild               bool
 	dist                     bool
 	jsonModuleGraph          bool
-	apiBp2build              bool // Generate BUILD files for Soong modules that contribute APIs
 	bp2build                 bool
 	queryview                bool
 	reportMkMetrics          bool // Collect and report mk2bp migration progress metrics.
@@ -869,8 +868,6 @@
 			c.jsonModuleGraph = true
 		} else if arg == "bp2build" {
 			c.bp2build = true
-		} else if arg == "api_bp2build" {
-			c.apiBp2build = true
 		} else if arg == "queryview" {
 			c.queryview = true
 		} else if arg == "soong_docs" {
@@ -970,7 +967,7 @@
 		return true
 	}
 
-	if !c.JsonModuleGraph() && !c.Bp2Build() && !c.Queryview() && !c.SoongDocs() && !c.ApiBp2build() {
+	if !c.JsonModuleGraph() && !c.Bp2Build() && !c.Queryview() && !c.SoongDocs() {
 		// Command line was empty, the default Ninja target is built
 		return true
 	}
@@ -1068,10 +1065,6 @@
 	return shared.JoinPath(c.SoongOutDir(), "queryview.marker")
 }
 
-func (c *configImpl) ApiBp2buildMarkerFile() string {
-	return shared.JoinPath(c.SoongOutDir(), "api_bp2build.marker")
-}
-
 func (c *configImpl) ModuleGraphFile() string {
 	return shared.JoinPath(c.SoongOutDir(), "module-graph.json")
 }
@@ -1113,10 +1106,6 @@
 	return c.bp2build
 }
 
-func (c *configImpl) ApiBp2build() bool {
-	return c.apiBp2build
-}
-
 func (c *configImpl) Queryview() bool {
 	return c.queryview
 }
@@ -1308,7 +1297,7 @@
 
 func (c *configImpl) UseRBE() bool {
 	// These alternate modes of running Soong do not use RBE / reclient.
-	if c.Bp2Build() || c.Queryview() || c.ApiBp2build() || c.JsonModuleGraph() {
+	if c.Bp2Build() || c.Queryview() || c.JsonModuleGraph() {
 		return false
 	}