Migrate String8|16.setTo to assignment operator

Bug: 295394788
Test: make checkbuild
Change-Id: I370f66c469de73064dec2e42c539dc236dd69d1e
diff --git a/tools/aapt/Resource.cpp b/tools/aapt/Resource.cpp
index 4a360ed..c5cbd51 100644
--- a/tools/aapt/Resource.cpp
+++ b/tools/aapt/Resource.cpp
@@ -779,7 +779,7 @@
         if (kIsDebug) {
             printf("Qualifying class '%s' to '%s'", name.c_str(), className.c_str());
         }
-        attr->string.setTo(String16(className));
+        attr->string = String16(className);
     }
 }
 
@@ -969,7 +969,7 @@
             return UNKNOWN_ERROR;
         }
         String8 origPackage(attr->string);
-        attr->string.setTo(String16(manifestPackageNameOverride));
+        attr->string = String16(manifestPackageNameOverride);
         if (kIsDebug) {
             printf("Overriding package '%s' to be '%s'\n", origPackage.c_str(),
                     manifestPackageNameOverride);
@@ -1007,7 +1007,7 @@
                 XMLNode::attribute_entry* attr = child->editAttribute(
                         String16(RESOURCES_ANDROID_NAMESPACE), String16("targetPackage"));
                 if (attr != NULL) {
-                    attr->string.setTo(String16(instrumentationPackageNameOverride));
+                    attr->string = String16(instrumentationPackageNameOverride);
                 }
             }
         }